birds, the sex chromosomes of males are of equal length and are referred to as the ZZ chromosomes - VCE - SSCE Biology - Question 10 - 2014 - Paper 1
Question 10
birds, the sex chromosomes of males are of equal length and are referred to as the ZZ chromosomes. female birds have sex chromosomes of unequal length that are refer... show full transcript
Worked Solution & Example Answer:birds, the sex chromosomes of males are of equal length and are referred to as the ZZ chromosomes - VCE - SSCE Biology - Question 10 - 2014 - Paper 1
Step 1
Parents' Genotypes
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Answer
The male is heterozygous for red head feathers, represented as ZZ'
Male genotype: Z'Z' (red head feathers)
Female genotype: ZW (black head feathers)
Step 2
Offspring Genotypes
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Answer
To determine the offspring genotypes, we perform a Punnett square:
Z'
Z'
Z
Z'Z
Z'Z
W
ZW
ZW
The resulting genotypes are:
Z'Z' (red head feathers)
ZW (black head feathers)
This results in a ratio of 2 red head feathered offspring to 2 black head feathered offspring.
Step 3
Offspring Phenotypes and Ratios
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Answer
The phenotypes of the offspring resulting from this cross:
