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3 years ago

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Tongue curling in humans is a dominate trait. Suppose a man who is Tt for tongue curling marries a woman who is also Tt for this

trait. What are the possible genotypes and phenotypes of their children and the percent chance for each? include genotypic and phenotypic ratios.

1 answer:

alukav5142 [94]3 years ago

3 0

25% no 75% yes.

Use a punnett square

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Answer:

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Ellis-van Creveld syndrome is a rare homozygous recessive disorder that affects bone growth. Individuals with this disorder are

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Answer:

1. 2.8%

2. 97.1%

Explanation:

If the birth rate of this disorder is 1 in every 5000 births it means that the frequency of the recessive homozygous genotype is 1/5000=0.0002

If we name the gene for the disorder with A, than the genotypes are aa (homozugous recessive), Aa (heterozygous, carrier), AA (dominant homozygous).

According to the Hardy-Weinberg equation:

frequency of AA is p2 (P)

frequency of Aa is 2pq

frequency of aa is q2 (Q) and

p2+2pq+q2=1 (P+Q=1)

Q=0.0002 P=1-0.0002=0.9998

q= $\sqrt$ 0.0002=0.014

p= $\sqrt$ 0.9998=0.999

2pq=0.028=2.8%

2. According to the Hardy-Weinberg equation:

frequency of AA is p2 (P)

frequency of Aa is 2pq

frequency of aa is q2 (Q) and

p2+2pq+q2=1 (P+Q=1)

The frequency of the recessive homozygous genotype (Q) is 1/5000=0.0002

Q=0.0002

q2=0.0002 2pq=0.028 p2=?

p2= 1-0.0002-0.028 =0.9718=97.1%

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