Which of the following statement is correct about the law of Independent Assortment?

Asked by maiuongarafransisca on coursehero.com

1) Which of the following statements correctly describes the Law of Independent Assortment?

Select one:

a. A large Punnett square can be used to predict the outcome of a parental cross involving two traits.

b. Sometimes all alleles lack dominance, which leads to a blending of traits.

c. The allele a gamete receives for one gene does not influence the allele received for another gene, if the two genes are located on different chromosomes.

d. The dominant allele is represented with an uppercase letter and the recessive allele is represented with a lowercase letter.

2) Which of the following parental crosses represents the genotype of a dwarf homozygous green pea plant crossed with a homozygous tall yellow pea plant?

Select one:

a. ttGG x TTgg

b. TTgg x ttGg

c. TtGG x TTGg

d. ttGg x Ttgg

3) How many possible allele combinations can be formed in the gametes produced from parents with the genotypes RRww and RrWW, respectively?

Select one:

a. 2 and 2

b. 1 and 2

c. 2 and 1

d. 1 and 1

4) What are the possible allele combinations that could be formed in the gametes produced from a parent with the genotype RrWw?

Select one:

a. RW, Rw, rW, and rw

b. RW and rw

c. RW, Rw, and rw

d. RW, RW, rw, and rw

5) Use the following information to answer the next three questions.

In guinea pigs, a black coat (B) is dominant over a white coat (b), and straight hair (S) is dominant over curly hair (s). The genes for coat color and type of hair are located on different chromosomes. A heterozygous, black, and straight hair guinea pig (BbSs) was test crossed

A) Which of the following genotypes would produce a population in which 50% of the offspring would have a black coat and all of the offspring would have curly hair?

Select one:

a. bbSS and bbSs

b. Bbss and bbss

c. BBSS and bbss

d. Bbss and BbSs

B) A guinea pig heterozygous for both traits mated with a homozygous recessive guinea pig. What is the probability of having offspring with at least one dominant trait?

Select one:

a. 0.00

b. 0.50

c. 0.75

d. 0.25

e. 1.0

6) Use the following information to answer the next two questions.

In mice, black fur (W) is dominant over white fur (w), and black eyes are dominant (R) over red eyes (r). The two genes are located on different chromosomes.

A male mouse with black fur and black eyes mated with a female mouse with white fur and red eyes. Out of 64 offspring, 30 had black fur and black eyes, and 34 had white fur and black eyes.

What is the genotype of the male parental mouse?

Select one:

a. WwRr

b. WwRR

c. WWRR

d. WWRr

7) A male mouse heterozygous for both fur and eye colour mated with a female mouse heterozygous for both traits.

Out of 64 offspring, how many mice can be expected to be heterozygous for both fur and eye colour?

Select one:

a. 1

b. 16

c. 4

d. 48

e. 36

f. 12

8) Use the following information to answer the next two questions.

In chickens, black feathers (B) are dominant over white feathers (b). The sex ratio of chickens is 50:50.

A) If two offspring result from the cross between a heterozygous hen and a heterozygous rooster, what is the probability both chicks will have the same homozygous dominant genotype (BB)?

Select one:

a. 0.500

b. 0.250

c. 0.0625

d. 0.125

B) If a heterozygous black hen mated with a white rooster, what is the probability an offspring would be a black rooster?

Select one:

a. 0.13

b. 0.50

c. 0.25

d. 0.75

9) Use the following information to answer the next two questions.

In horses, tobiano is a white spotting pattern. The tobiano allele (T) is dominant over the non-tobiano (t) allele.

A) What is the probability, expressed as a percentage, of two heterozygous horses producing two non-tobiano foals in succession?

Express answer as a percentage rounded to two decimal places

B) What is the probability of the third foal being tobiano?

Record answer as a value between 0 and 1 rounded to two decimal places. 

10) Use the following information to answer the next three questions.

In rabbits, white fur colour (W) is dominant over black fur colour (w), and upright ears (U) are dominant over floppy ears (u). The two genes are on different chromosomes. A baby rabbit is called a kit.

A white rabbit with upright ears, heterozygous for both traits, mated with a homozygous white rabbit with floppy ears.

A) What are the possible phenotypes of the offspring?

Select one:

a. Black floppy and black upright

b. White floppy and white upright

c. White floppy and black upright

d. Black floppy and white upright

B) A heterozygous white rabbit with floppy ears mated with a black rabbit with heterozygous upright ears.

What is the probability of having a black kit with upright or floppy ears?

Select one:

a. 0.25

b. 0.06

c. 0.13

d. 0.50

C) Two white rabbits with upright ears, heterozygous for both traits, mated and produced offspring.

What is the probability the first offspring has black fur with upright ears and the second offspring has white fur with floppy ears?

Select one:

a. 

b. 

c. 

d. 

e. 

11) Which of the following scenarios best describes an epistatic gene?

Select one:

a. Individuals with sickle cell anemia and carriers of the sickle cell allele have some resistance to malaria.

b. Mouse fur colours are expressed as a blend of the dominant black colour and the recessive white colour, resulting in a heterozygous brown colour.

c. Fur pattern is controlled by two genes such that one gene inhibits the expression of the other gene.

d. Chicken combs follow a dominance hierarchy whereby a walnut comb is the most dominant and a single comb is the least dominant.

12) In corn plants, a dominant allele (K) allows kernel colour and a recessive allele (k) inhibits kernel colour when homozygous. On a different chromosome, the dominant gene P causes purple kernel colour and the homozygous recessive genotype causes red kernel colour.

A true breeding white corn plant was crossed with a purple corn plant, yielding 50% red corn plants and 50% purple corn plants.

What are the genotypes of the parental corn plants?

Select one:

a. KKPP x kkPp

b. KKPp x kkpp

c. kkPp x KkPp

d. KkPP x kkPP

13) Use the following information to answer the next two questions.

Feather colour in parakeets is controlled by two genes. Blue colour (B) is dominant over absence of colour (b). Yellow colour (Y) is dominant over absence of colour (y). When a B allele and a Y allele are present, a green parakeet is produced.

The probability of obtaining a female or male parakeet is the same as for humans.

A) What is the probability of obtaining a male green parakeet when a green parakeet heterozygous for both genes is crossed with a white parakeet?

Select one:

a. 0.25

b. 0.13

c. 0.50

d. 0.75

B) A green parakeet crossed with a white parakeet produced offspring with four different colour patterns.

What is the genotype of the green parakeet?  

a) BBYY

b) BBYy

c) BByy

d) BbYY

e) BbYy

f) Bbyy

g) bbYY

h) bbYy

i) bbyy

14) Which of the following statements does NOT describe an environmental influence on the expression of a gene?

Select one:

a. Exposure to sunlight increases melanin production in human skin.

b. Siamese cats have darkened paws, nose, and tip of tail due to a gene that allows their skin and fur to darken in the parts of their bodies that need to retain more heat, their extremities.

c. More than a single gene is involved in the expression of human height, weight, and skin colour.

d. Colder incubation temperatures of gecko eggs yield more females and warmer temperatures yield more males.

15) Melanin is a skin pigmentation that absorbs and dissipates broadband UV rays. Since UV radiation causes DNA damage, melanin pigments protect the skin and reduce the risk of cancer. When skin is exposed to sunlight, melanin production is increased, causing the skin to tan. This demonstrates that

Select one:

a. the expression of some genes is influenced by the environment

b. the environment causes mutations that have no effect on the chance of survival

c. the environment causes mutations that increase the chance of survival

d. the environment causes mutations that have a large effect on the chance of survival

16) Which of the following statements correctly describes the Chromosomal Theory of Inheritance?

Select one:

a. The factors that determine our traits are found on chromosomes.

b. Homologous chromosomes separate independently during meiosis.

c. Each person has two copies of the factors that determine our traits.

d. X and Y chromosomes determine whether an individual is genetically male or female.

17) Which of the following is NOT true of Y-linked traits?

Select one:

a. They are always expressed.

b. They are extremely uncommon in females.

c. They are passed from father to son.

d. They carry both dominant and recessive alleles of a trait.

18) Red-green colour blindness is a sex-linked trait. Red-green colour blindness (Xrg) is the inability to distinguish between red and green colours. The Xrg allele is recessive to the normal X-linked allele.

A normal woman has a father who has red-green colour blindness. She had a child with a man who does not have red-green colour blindness.

What is the probability they will have a son with red-green colour blindness?

Select one:

a. 0.13

b. 0.50

c. 0

d. 0.2

19) Which of the following statements is true for sex-linked traits in birds?

Select one:

a. Females can inherit an allele for a Z-linked trait only from their father, and males can inherit an allele for a Z-linked trait only from their mother.

b. Females can inherit an allele for a Z-linked trait only from their father, and males can inherit an allele for a Z-linked trait from either their mother or father.

c. Males can inherit an allele for a Z-linked trait only from their mother, and females can inherit an allele for a Z-linked trait from either their mother or father.

d. Both sexes can inherit an allele for a Z-linked trait from either their mother or father.

20) Which of the following statements best describes the events associated with the recombination of genes?

Select one:

a. If two genes are located on the same chromosome, the alleles on non-sister chromatids of homologous chromosomes will segregate together if a crossover does not occur between the two genes.

b. If the alleles in gametes after meiosis are different from those in the parents, the gametes are referred to as recombinant.

c. Crossovers are most likely to occur between linked genes that are close together.

d. Any two genes located on the same chromosome are called linked genes.

21) Another Vulcan trait that is dominant over Earthling alleles is absence of adrenal glands (A).

The genes for ear shape (P/p) and heart sidedness (R/r) are 20 map units apart on chromosome 7. The gene for adrenal glands (A/a) is on chromosome 3.

If Mr. Spock fathers a child with an Earthling female, what are the chances that the child will have pointed ears and adrenal glands?

Select one:

a. 20%

b. 25%

c. 10%

d. 50%

22) Two genes called TE and X1 were studied in a lab. 45 out of 500 offspring from crosses involving these two genes had recombinant genotypes.

What is the recombinant frequency of the genes TE and X1?

Select one:

a. 18%

b. 4.5%

c. 50%

d. 9%

23) Two genes, N and O, are 27 map units apart. If parents heterozygous for these genes were test crossed, and 500 offspring resulted, how many would be recombinants for genes N and O?

Select one:

a. 315

b. 140

c. 130

d. 27

e. 135

24) The recombinant frequency of two genes, A and B, located on the same chromosome is 38%.

Parents heterozygous for genes A and B were test crossed, and 250 offspring resulted. How many of the offspring would have parental genotypes for genes A and B

25) In a testcross, the parent that is homozygous recessive for the genes being studied is called the testcross parent. The parent that has the dominant phenotype of the genes being studied is called the non-testcross parent.

Which of the following is NOT a reason that a testcross is a useful technique when studying the inheritance of a trait?

Select one:

a. Because the testcross parent can contribute only recessive alleles, the alleles contributed by the other parent will be expressed in the offspring of the testcross.

b. The relative frequencies of the different phenotypes among the testcross progeny can be used to map linked genes.

c. A testcross can determine if an individual with the dominant phenotype is homozygous or heterozygous.

d. The gametes produced by the testcross parent are determined from the testcross progeny.

26) Use the following information to answer the next three questions.

A defective gene on chromosome 15 causes Tay-Sachs disease. It is a central nervous system neurodegenerative disease that most often affects infants, though older children and adults can have late-onset forms of the disease. The defective gene prevents the body from making a protein called hexosaminidase A. Without, hexosaminidase A, chemicals called gangliosides build up in the nerve cells of the brain, destroying brain cells.

A) A couple has one daughter with Tay-Sachs disease and three other unaffected children. Neither the mother, nor father, nor any of the biological grandparents of the affected daughter have had the disease. Tay-Sachs disease most likely demonstrates what type of inheritance?

Select one:

a. autosomal recessive

b. X-linked dominant

c. autosomal dominant

d. X-linked recessive

Answered by pankajkumarmahato994 on coursehero.com

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