Multiple Choice
In a population of cats where the fur color is determined by a single gene with two alleles, B (black) and b (white), which of the following fur colors are possible in females with the genotype Bb?
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13. Mendelian Genetics
Genotype vs. Phenotype
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Which of the following genotypes is considered homozygous?
A
aA
B
Aa
C
aa
D
AA
Verified step by step guidance1
Understand the concept of homozygosity: A genotype is considered homozygous when both alleles for a particular gene are the same. This can be either dominant (AA) or recessive (aa).
Identify the alleles in each genotype: In the given options, 'aA' and 'Aa' have different alleles, while 'aa' and 'AA' have identical alleles.
Determine which genotypes are homozygous: Since homozygous genotypes have identical alleles, 'aa' and 'AA' are homozygous.
Differentiate between homozygous dominant and homozygous recessive: 'AA' is homozygous dominant, and 'aa' is homozygous recessive.
Conclude that both 'aa' and 'AA' are considered homozygous genotypes, as they consist of identical alleles.
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