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3 years ago

Explain how traits that are not expressed in one generation can reappear in the next generation

Biology

1 answer:

Nataly_w [17]3 years ago

8 0

Recessive traits can skip a generation because a dominant phenotype can by either homozygous or heterozygous genotypes. So 2 heterozygous people would have the dominant phenotype for a trait but since they each have a recessive allele, they both could pass a recessive allele to their offspring. This would be a Monohybrid cross.

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Given the following cross TtYyRr x TtyyRr (T = tall; t = short Y = yellow; y = green R = round; r = wrinkled), what proportion o

mihalych1998 [28]

Answer:

3/32 ttyyR-

Explanation:

Cross: Tall, Yellow, Rounded individuals with a tall, green, rounded individual

Parentals) TtYyRr x TtyyRr

Gametes) TYR, TyR, TYr, Tyr, tYR, tyR, tYr, tyr (Parent one)

TyR, TyR, Tyr, Tyr, tyR, tyR, tyr, tyr (Parent two)

We need to know what proportion of offspring is expected to be short plants with round, green seeds. So we need to identify the gametes for these traits. The genotypes are:

Shot → tt
Round → RR or Rr
Green → yy

⇒ Parent one can provide gametes tyR and tyr

⇒ Parent two can provide gametes tyR and tyr

(1/8 tyR x 2/8 tyR) + (1/8 tyR x 2/8 tyr) + (1/8 tyr x 2/8 tyR) =

2/64 ttyyRR + 2/64 ttyyRr + 2/64 ttyyRr =

1/32 ttyyRR + 2/32 ttyyRr =

3/32 ttyyR-

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How can Punnett squares be used to determine an organism's genotypic and phenotypic probabilities?

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⭐----------------------------------------------------------------------------------------------⭐

<h2>BRAINLYMENTALMENTE</h2>

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