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10- In a large interbreeding population 81% ofthe individuals are homozygous for a recessive character. In theabsence of mutation or selection, what percentage of the nextgeneration would be homozygous recessive? Homozygous dominant?Heterozygote?

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Tod Thiel
Tod ThielLv2
28 Sep 2019

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In a population of 50 individuals, 20 are homozygous dominant,25 are heterozygous, and 5 are homozygous recessive. If 20% of theDOMINANT PHENOTYPE are eaten by birds, what will be the NEWRECESSIVE ALLELE FREQUENCY in the remaining population?

(Hint: How many individuals express the dominant phenotype inthe current population? In the new population?)

Question 9 options:

A.30% (0.30)
B.

10% (0.10)
C.

36.5% (0.365)
D.

12.1% (0.121)
In drosophila, the allele for normal-length wings is dominant over the allele for vestigial wings. In a population of 1,000 individuals, 360 show the recessive phenotype. How many individuals would you expect to be homozygous dominant and heterozygous for this trait?

Flower position, stem length, and seed shape were three characters that Mendel studied. Each is controlled by an independently assorting gene and has dominant and recessive expression as follows:

Character Dominant Recessive

Flower Position Axial (A) Terminal (a)

Stem Length Tall (T) Dwarf (t)

Seed Shape Round (R) Wrinkled (r)

If a plant that is heterozygous for all three characteristics is allowed to self-fertilize, what proportion of the offspring would you expect to be as follows?

a. homozygous for the three dominant traits

b. homozygous for the three recessive traits

c. heterozygous for all three characters

d. homozygous for axial and tall, heterozygous for seed shape

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