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13. Mendelian Genetics

Test Crosses

13. Mendelian Genetics

Test Crosses

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Jason Amores Sumpter

Steps to Performing a Test Cross

Steps to Performing a Test Cross

Jason Amores Sumpter

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Animation: Testcross in "MendAliens"

Animation: Testcross in "MendAliens"

Monohybrid Test Cross (Mendel's Experiments)

Monohybrid Test Cross (Mendel's Experiments)

Test Crosses | Genetics

Test Crosses | Genetics

Practice this topic

Multiple Choice

A single gene test cross is conducted to determine the genotype of a pea plant that shows the dominant phenotype for height (T = tall, t = short). If all offspring of the cross show the dominant phenotype, then the genotype of the unknown parent is _______.

a) TT.

b) tT.

c) Tt.

d) tt.

Multiple Choice

You want to determine the pea color genotype of a pea plant with yellow peas. You conduct a test cross with your mystery pea plant. The test cross results in 50% of the offspring possessing yellow peas and 50% of the offspring possessing green peas. What is the genotype for pea color of the mystery parent?

a) YY.

b) Yy.

c) yy.

d) None of the above.

Multiple Choice

What is indicated when a single-character testcross yields offspring that all have the dominant phenotype?

Multiple Choice

A gray-bodied, vestigial-winged fly is crossed with a black-bodied, normal-winged fly. The F₁ progeny is testcrossed. Among the resulting offspring, __________ is a parental type, and __________ is a recombinant type.

Multiple Choice

To identify the genotype of a yellow-seeded pea plant as either homozygous dominant (YY) or heterozygous

(Yy), you could do a test cross between your mystery plant and a plant with a genotype of _______.

Textbook Question

In flies, small wings are recessive to normal wings. If a cross between two flies produces 8 small-wing offspring and 28 normal-wing offspring, what are the most likely genotypes of the parents? (Use S to represent the normal-wing allele and s to represent the short-wing allele.)

Textbook Question

In flies, small wings are recessive to normal wings. If a cross between two flies produces 8 small-wing offspring and 28 normal-wing offspring, what are the most likely genotypes of the parents? (Use S to represent the normal-wing allele and s to represent the short-wing allele.)

Textbook Question

In 1981, a stray black cat with unusual rounded, curled-back ears was adopted by a family in Lakewood, California. Suppose you owned the first curl cat and wanted to breed it to develop a true-breeding variety. Describe tests that would determine whether the curl gene is dominant or recessive and whether it is autosomal or sex-linked. Explain why you think your tests would be conclusive. Describe a test to determine that a cat is true-breeding.

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