Question

Which of the following crosses would always result in offspring that only display the dominant phenotype? TT x tt Tt x Tt TT x TT Tt x tt both A and C

Answer 1

Answer:

both A and C

Explanation:

To know whats happens with all the offspring and the probabilities you need to draw Punnett squares.

We will call T the dominant trait and t the recessive.

TT x tt = Tt Tt Tt Tt = 100% Tt

100% of the offspring will show the dominant allele.

Tt x Tt = TT Tt tT tt =25% TT 50% Tt 25% tt

Here, you have 25% chances that the offspring shows the recessive allele.

TT x TT = TT TT TT TT= 100% TT

100% of the offspring will show the dominant allele.

Tt x tt = Tt tt tt tt = 25% Tt 75% tt

Here, you have 75% chances that the offspring shows the recessive allele.

Answer 2

The crosses that always result in offspring that only display the dominant phenotype include TT x tt, and TT x TT (both A and C are correct).

Dominance in genetics

Dominance refers to the genetic phenomenon where one allele called dominant masks the expression of a recessive allele in heterozygous individuals.

• Heterozygous are individuals that carry two different alleles for the same gene locus.

• An allele is a given gene variant, diploid organisms have two alleles for each locus.

In conclusion, the crosses that always result in offspring that only display the dominant phenotype include TT x tt, and TT x TT (both A and C are correct).

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