Gene W that undergoes independent assortment affect fruit color in summer squash
ID: 181404 • Letter: G
Question
Gene W that undergoes independent assortment affect fruit color in summer squash. This gene has two alleles, one of which (W) is dominant for fruit color, allele W code for white fruit, allele w code for yellow fruit, if we cross Aa with Aa a) What ratio of white:yellow fruit is expected from the cross Aa times Aa? b) What percentages of F1 generation have yellow fruits? c) What percentages of F1 generation arc homozygote for white color fruit? d) What percentages of F1 generation arc homozygote for yellow color fruit? e) What percentages of F1 general ion are heterozygote for white color fruit?Explanation / Answer
(a)
A
a
A
AA (white fruit)
Aa (white fruit)
a
Aa (white fruit)
aa (yellow fruit)
3 white: 1yellow fruit we will get from the cross Aa x Aa
Homozygous for white color fruit: 25%- AA
Homozygous for yellow color fruit: 25%- aa
Heterozygous: 50%- Aa
(b) We will get 25% of F1 generation with yellow fruits
(c) 25% percentages of F1 generation are homozygotes for white color fruit (AA-25%). Homozygotes will have two identical alleles of a particular gene, so AA and aa are known to be homozygotes. AA is homozygous for white color fruit.
(d) 25% percentages of F1 generation are homozygotes for yellow color fruit (aa-25%)
(e) 50% percentages of F1 generation are heterozygous for white color fruit. Heterozygotes will have one dominant and one recessive allele (Aa), but dominant will be expressed here.
A
a
A
AA (white fruit)
Aa (white fruit)
a
Aa (white fruit)
aa (yellow fruit)
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