Quiz 12 Mendel

A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism?

A) Hh

B) HT

C) T

D) HhTt

B) HT

Albinism is an autosomal (not sex-linked) recessive trait. A man and woman are both of normal pigmentation, but both have one parent who is albino (without melanin pigmentation). What is the probability that their first child will be an albino?

A) 1/2

B) 1

C) 1/4

D) 0

C) 1/4

How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?

A) 16

B) 4

C) 8

D) 64

C) 8

Mendel accounted for the observation that traits that had disappeared in the F1 generation reappeared in the F2 generation by proposing that _____.

A) the mechanism controlling the appearance of traits was different between the F1 and the F2 plants

B) members of the F1 generation had only one allele for each trait, but members of the F2 had two alleles for each trait

C) traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1

D) new mutations were frequently generated in the F2 progeny, "reinventing" traits that had been lost in the F1

C) traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1

Mendel crossed yellow-seeded and green-seeded pea plants and then allowed the offspring to self-pollinate to produce an F2 generation. The results were as follows: 6022 yellow and 2001 green (8023 total). The allele for green seeds has what relationship to the allele for yellow seeds?

A) dominant

B) codominant

C) incomplete dominant

D) recessive

D) recessive

Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?

A) prophase I of meiosis

B) metaphase II of meiosis

C) anaphase I of meiosis

D) anaphase II of meiosis

C) anaphase I of meiosis

The individual with genotype AaBbCCDdEE can make many kinds of gametes. Which of the following is the major reason?

A) the tendency for dominant alleles to segregate together

B) crossing over during prophase I

C) recurrent mutations forming new alleles

D) different possible assortment of chromosomes into gametes

D) different possible assortment of chromosomes into gametes

Use the figure and the following description to answer the question(s) below. In a particular plant, leaf color is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F2 is diagrammed in the Punnett square shown in the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants with dark leaves?

A) 2 and 3

B) 1, 2, and 3

C) 1 only

D) 4 only

B) 1, 2, and 3

Use the figure and the following description to answer the question(s) below. In a particular plant, leaf color is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F2 is diagrammed in the Punnett square shown in the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants with a heterozygous genotype?

A) 2, 3, and 4

B) 2 and 3

C) 1, 2, and 3

D) 1

B) 2 and 3

Use the figure and the following description to answer the question(s) below. In a particular plant, leaf color is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F2 is diagrammed in the Punnett square shown in the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants that will be true-breeding?

A) 1 only

B) 1, 2, 3, and 4

C) 2 and 3 only

D) 1 and 4 only

D) 1 and 4 only