Biology, 03.01.2020 21:31 iamcuriousdelip08rmf

The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). what is the probability of two parents heterogeneous for a widow’s peak (ww) having an offspring without a widow’s peak?

25 percent
0 percent
50 percent
75 percent

Answers: 2

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Answer from: josecano2

25 percent

Explanation:

Alleles: W x w

Widows peak x straight hairline

W shows complete dominance over w; complete dominance involves dominant and recessive allelesDominant alleles always show more influence over recessives

Parents are heterogenous...

∴ their genotypes: Ww x Ww

phenotypes: Widow's peak x Widow's peak

From the punnet square of the parent cross:

F1, offspring: TT; Tt; Tt; tt

genotypes: 1 TT: 2 Tt: 1 tt

∴ the genotypic ratio: 1: 2: 1

phenotypes: Widow's peak; Widow's peak; Widow's peak; Straight

There is one offspring without a widow's peak= $= \frac{1}{4}$ = 25%

The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). wh

Answer from: jazzy4713

Option A

Explanation:

It is given that widow’s peak trait's allele is completely dominant over straight hairline trait's allele.

This means that in any heterozygous gamete , the characteristics associated with the widow’s peak trait will be expressed thereby subsiding the straight hairline trait

Gamete of the heterogeneous parents (Ww) is W, w

Cross between the two heterogeneous parents will produce following offspring

Ww * Ww

WW, Ww, Ww, ww

Thus out of four offspring, three offspring (WW, Ww, Ww) will have widow’s peak while only one offspring (ww) will have straight hairline

Hence, the probability of an offspring without a widow’s peak is

$\frac{1}{4} * 100\\= 25$ %

Hence, option A is correct

Answer from: Quest

No that answer is wrong. you have written the function of mitochondria in chloroplast and function of chloroplast in mitochondria.

Answer from: Quest

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The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). wh...