Multiple Choice
What does a phenotype ratio of 3:1 among offspring in a monohybrid cross indicate?
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2. Mendel's Laws of Inheritance
Monohybrid Cross
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In Mendel's monohybrid cross, if both parents are homozygous recessive for height (genotype tt), what is the expected ratio of tall to short offspring?
A
0:1 (all short)
B
1:1 (tall to short)
C
1:0 (all tall)
D
3:1 (tall to short)
Verified step by step guidance1
Identify the genotypes of the parents. Both parents are homozygous recessive for height, so their genotypes are tt and tt.
Determine the possible gametes each parent can produce. Since both are tt, each parent can only produce gametes carrying the t allele.
Set up a Punnett square to find the genotypes of the offspring by combining the gametes from each parent. The only possible combination is tt.
Interpret the genotype of the offspring. Since tt is the homozygous recessive genotype, all offspring will express the recessive phenotype, which is short height.
Conclude the expected phenotypic ratio of tall to short offspring. Since all offspring are short, the ratio is 0 tall : 1 short.
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