Questions 18-21: refer to the following genetics cross: Albinism is a condition
ID: 176379 • Letter: Q
Question
Questions 18-21: refer to the following genetics cross: Albinism is a condition that results from the lack of normal pigmentation In humans, individuals with two recessive alleles at the ALBINO (aa) ocus are albino. Hitchikers thumb result from two recessive alleles at the (tt) THUMB locus. An albino man with hitchiker's thumbs marries a pigmented woman with hitchiker's thumbs. They have 20 children, (the F1) none of them twins. All of their children are pigmented with hitchiker's thumbs. 18) What is the most likely genotype of the man? A AAtt B) aaTL. C) AaTt D) AATT E) aatt 19) What set of alleles for thumbs and pigmentation do the woman's gametes carry? A) at B) T C) AA tt D) At E) Aa Tt 20) What is the genotype of their children? A) aatt B) aaTT C) AaIt D) Aatt E) all of the above are possible 21) What proportion of the gametes from their children (the F1) would be expected to contain the recessive allele for pigmentation and the recessive allele for hitchiker's thumb? A) 9/16 B) 3/4 C) 1/4 D) 1/2 E) 0%Explanation / Answer
18.E) aatt
most likely genotype of man is aatt - Man with Albino (aa) and Hitchiker's thumb (tt). so the genotype of a man is aatt
19.D) A t
Woman with Pigmented (AA or Aa) with Hitchiker's thumb (tt). so geotype is AAtt or Aatt. so the gametes are A t or At, at
20.D) AAtt
in the question given that Childrens are pigmented (AA) with Hitchiker's thumb (tt). so the genotype of the children is AAtt
21.E) 0%
Gametes from their childrens. childrens have genotype AAtt. so the gametes are At
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