Which of the following crosses will produce all homozygous offspring?

Question

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Restating the problem and the options helps set the stage for analysis.
Question: Which of the following crosses will produce all homozygous offspring?
Options:
- BB x BB
- BB x Bb
- Bb x Bb
- BB x bb

Option 1: BB x BB
This cross involves two individuals each homozygous dominant for the trait. Every gamete produced carries the B allele, so all offspring inherit B from both parents and have the genotype BB. That means every offspring is homozygous for the trait (homozygous dominant).

Option 2: BB x Bb
Here one parent is homozygous dominant (BB) and the other is heterozygous (Bb). The B allele from the BB parent combines with either B or b from the Bb parent, yielding 50% BB and 50% Bb among the offspring. Since Bb is heterozygous, not all offspring are homozygous.

Option 3: Bb x Bb
Both parents are heterozygous (Bb). The possible offspring genotypes follow a typical 1:2:1 ratio: 25% BB, 50% Bb, 25% bb. This mix includes homozygous dominant (BB), heterozygous (Bb), and homozygous recessive (bb), so offspring are not all homozygous.

Option 4: BB x bb
One parent provides the dominant allele B and the other provides the recessive allele b. All offspring receive one B and one b, resulting in the genotype Bb for every offspring. Bb is heterozygous, so these offspring are not homozygous.

In summary, evaluating the offspring genotypes from each cross reveals that only crosses between two homozygous identical genotypes tend to produce uniform homozygosity in all offspring, whereas mixes involving heterozygotes or recessive carriers introduce heterozygosity or homozygous recessive outcomes as well.

BIOL1111.30087.202530 1111 Quiz 6

Which of the following crosses will produce all homozygous offspring?

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