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Chapter 12: Q. 30 (page 328)
Use the probability method to calculate the genotypes and genotypic proportions of a cross between AABBCc and Aabbcc parents
As a result, the ratios are 1:1:1:1.
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Which is one of the seven characteristics that Mendel observed in pea plants?
a. flower size
b. seed texture
c. leaf shape
d. stem color
Imagine you are performing a cross involving seed color in garden pea plants. What F1offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over the green.
a. 100 percent yellow-green seeds
b. 100 percent yellow seeds
c. 50 percent yellow, 50 percent green seeds
d. 25 percent green, 75 percent yellow seeds
The gene for flower position in pea plants exists as axial or terminal alleles. Given that axial is dominant to terminal, list all of the possible F1 and F2 genotypes and phenotypes from a cross involving parents that are homozygous for each trait. Express genotypes with conventional genetic abbreviations.
If the allele encoding polydactyly (six fingers) is dominant why do most people have five fingers?
a. Genetic elements suppress the polydactyl gene.
b. Polydactyly is embryonic lethal.
c. The sixth finger is removed at birth.
d. The polydactyl allele is very rare in the human population.
Why is it more efficient to perform a test cross with a homozygous recessive donor than a homozygous dominant donor? How could the same information still be found with a homozygous dominant donor?
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