10911206/2612: Assignment 8

Opened: Tuesday, 28 April 2020, 9:15 PM

Due: Sunday, 3 May 2020, 9:15 PM

____1. Pea plants were particularly well suited for use in Mendel's breeding experiments for all of the following reasons except that

a. peas show easily observed variations in a number of characters, such as pea shape and

flower color.

b. it is possible to completely control matings between different pea plants.

c. it is possible to obtain large numbers of progeny from any given cross.

d. peas have an unusually long generation time.

e. many of the observable characters that vary in pea plants are controlled by single genes.

____ 2. A plant with purple flowers is allowed to self-pollinate. Generation after generation, it produces purple flowers. This is an example of

a. hybridization.

b. incomplete dominance.

c. true-breeding.

d. the law of segregation.

e. polygenetics.

____ 3. Which of the following statements about Mendel's breeding experiments is correct?

a. None of the parental (P) plants were true-breeding.

b. All of the F2 progeny showed a phenotype that was intermediate between the two parental (P) phenotypes.

c. Half of the F1 progeny had the same phenotype as one of the parental (P) plants, and the other half had the same phenotype as the other parent.

d. All of the F1 progeny resembled one of the parental (P) plants, but only some of the F2 progeny did.

e. none of the above

____ 4. What is the difference between a monohybrid cross and a dihybrid cross?

a. A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents.

b. A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny.

c. A monohybrid cross involves organisms that are heterozygous for a single character, whereas a dihybrid cross involves organisms that are heterozygous for two characters.

d. A monohybrid cross is performed only once, whereas a dihybrid cross is performed twice.

e. A monohybrid cross results in a 9:3:3:1 ratio whereas a dihybrid cross gives a 3:1 ratio.

____ 5. A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in

offspring with purple flowers. This demonstrates

a. the blending model of genetics.

b. true-breeding.

c. dominance.

d. a dihybrid cross.

e. the mistakes made by Mendel.