In a population, there are two different alleles for a gene. D is dominant and d is recessive. If two organisms that are Dd mate, which of the following lists the results possible offspring?

Rationale

DD, Dd, and dd are the possible offspring resulting from a Dd x Dd mating.

When two heterozygous organisms (Dd) mate, the potential combinations of alleles in their offspring can be determined using a Punnett square. The possible genotypes include one homozygous dominant (DD), two heterozygous (Dd), and one homozygous recessive (dd).

A (DD and dd) YOUR ANSWER

This option suggests that only homozygous dominant (DD) and homozygous recessive (dd) offspring can result from the mating. However, it overlooks the possibility of producing heterozygous offspring (Dd), which is crucial when both parents carry the dominant allele.

B (DD, Dd, and dd) CORRECT

This option accurately reflects all potential genotypes that can arise from the cross of two Dd parents. The offspring can be DD (homozygous dominant), Dd (heterozygous), or dd (homozygous recessive), providing a complete picture of the genetic outcomes.

C (Dd and dd) YOUR ANSWER

This choice incorrectly implies that only heterozygous (Dd) and homozygous recessive (dd) offspring can result. It omits the homozygous dominant genotype (DD), which is a possible outcome from the Dd x Dd cross.

D (All Dd) YOUR ANSWER

This option mistakenly suggests that all offspring will be heterozygous (Dd). While Dd offspring are indeed produced, it fails to recognize the potential for homozygous dominant (DD) and homozygous recessive (dd) offspring as well.

Conclusion

In a genetic cross between two Dd individuals, the offspring can be DD, Dd, or dd, reflecting the combinations of alleles they inherit. The accurate representation of these outcomes is essential in understanding inheritance patterns. Thus, option B correctly encompasses all possible results from this mating scenario.

In a population, there are two different alleles for a gene. D is dominant and d is recessive. If two organisms that are Dd mate, which of the following lists the results possible offspring?

DD, Dd, and dd are the possible offspring resulting from a Dd x Dd mating.

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