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question 2
which one of these is considered homozygous recessive?

1. bb
2. bb
3. bb
4. b

Explanation:

In genetics, homozygous means having two identical alleles for a particular gene. Recessive alleles are typically represented by lowercase letters. So, for a homozygous recessive genotype, both alleles should be lowercase and the same.

• Option 1: \( Bb \) has one dominant (\( B \)) and one recessive (\( b \)) allele. It is heterozygous.
• Option 2: \( bb \) has two recessive alleles. It is homozygous recessive.
• Option 3: \( BB \) has two dominant alleles. It is homozygous dominant.
• Option 4: \( b \) is just a single allele, not a genotype representing a pair of alleles.

Answer:

1. \( bb \)