Check-In Assignment # 1 Punnett Squares Practice Practice-Problem#Zr In humans,

Question

Check-In Assignment # 1 Punnett Squares Practice Practice-Problem#Zr In humans, the allele for tongue rolling (R) is dominant over the allele for non-tongue rolling (r). A heterozygous male is crossed with a homozygous recessive female. What are the resulting genotypic and phenotypic ratios for their offspring (Generation I)? Genotypic Ratio: Phenotypic Ratio: PracticeProblem13 In humans, the allele for PTC tasting (T) is dominant over the allele for non-PTC tasting ().A homozygous dominant male is crossed with a homozygous recessive female. What are the resulting genotypic and phenotypic ratios for their offspring (Generation 1)? Genotypic Ratio: Phenotypic Ratio:

Explanation / Answer

Problem #2

Heterozygous Tongue rolling male genotype ‘Rr’

Possible gametes = R and r

Homozygous non-tongue rolling female genotype ‘rr’

Possible gametes = r

Gametes

r

R

Rr

r

rr

Offspring genotypic ratio = 1:1 (1 Rr and 1 rr)

Offspring phenotypic ratio = 1:1 (1 Tongue rolling and 1 non-tongue rolling)

Problem #3

Homozygous dominant male for PTC tasting genotype= ‘TT’

Possible gametes = T

Homozygous recessive female for non-PTC tasting genotype= ‘tt’

Possible gametes = t

Gametes

T

t

Tt

Offspring genotypic ratio =1 (100% Tt)

Offspring phenotypic ratio =1 (100% PTC tasting-heterozygous)

Gametes

r

R

Rr

r

rr

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