Chapter+20+BH

Question 1

Alternate forms of a gene having the same position on a pair of chromosomes and affecting the same trait are called. B

A) chromatids

B) alleles

C) DNA segments

D) centrioles

Question 2

People who appear normal but can pass on an allele for a genetic disorder are called. A

A) deficient

B) recessive

C) latent

D) carriers

Question 3

Genotype refers to an individual's: C

A) appearance

B) genes.

C) blood type.

D) ear lobes.

Question 4

If a person has both alleles for the dominant trait, his genotype is represented as:

A

A) 2 capital letters.

B) 1 capital and 1 lowercase letter

C) 2 lowercase letters.

Question 5

A heterozygous genotype is represented by:

B

A) 2 capital letters.

B) 1 capital letter and 1 lowercase letter.

C) 2 lowercase letters.

Question 6

Which of the following is not one of the 3 possible zygotes involving height?

B

A) Tt

B) tt

C) Ts

D) TT

Question 7

Since homologous chromosomes are separated during meiosis, the gametes will have copy/copies of each allele.

A) 1

B) 2

C) various

D) no

Question 8

Given a genotype of T T, what are the possible gametes? A

A) all are T

B) all are T T

C) half are T and half are t

Question 9

Given the following notation - Ff. This represents:

C

A) a phenotype.

B) a genotype

C) a gamete.

D) a gonad

Question 10 Set up a Punnett square of your choice of alleles. Example, cross a heterozygous tall pea plant with a homozygous dominant tall pea plant.

A phenotype ratio of _ is expected if a heterozygous genotype is crossed with a homozygous dominant genotype.

C

A) 1:0

B) 1:1

C) 1 : 2: 1

D) 3:1

Question 11 Set up a Punnett square

A heterozygous brown bull mates with a white cow. (Brown is the dominant trait). What are the expected phenotype ratios?

D

A) 100% brown

B) 100% white

C) 50% brown and 50 % white

D) 50% brown and 50% tan

Question 12

A rough coat of a guinea pig is dominant over a smooth coat. If 100% of the offspring are smooth coated, what are the genotypes and phenotypes of the parents?

C

A) RR - homozygous dominant rough and Rr - heterozygous rough

B) Rr - heterozygous rough and rr homozygous recessive smooth

C) Both parents are rr - homozygous recessive smooth

D) RR - homonzygous dominant rough and rr - homozygous recessive smooth.

Question 13 Set up a Punnett square

Two heterozygous tall pea plants are cross-pollinated. What are the phenotype ratios of the offspring?

B

A) 50% tall and 50% short (1:1)

B) 75% tall and 25% short (3:1)

C) 25% tall and 75% short (1:3)

D) 100% tall (1:0)

Question 14

In reference to the previous question, what are the expected genotypes of the offspring? D

A) 25% TT, 50% Tt, 25% tt (1:2:1)

B) 75% Tt, 25% tt (3:1)

C) 50% TT, 25% Tt, 25%tt (2:1:1)

D) 50 % TT, 50 %Tt (1:1)

Question 15

An autosomal recessive disorder that usually occurs among Jewish people, where they lack the enzyme Hex A is called: B