Question

question 23
which describes a genotype homozygous dominant for a single trait?
aaaa
aabb
aa
aa
aa
question 24
____ of genetic disorders do not show traits of the disorder.
carriers
victims
pedigrees
alleles
question 25
the process by which homologous chromosomes exchange genetic material:
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Explanation:

• Question 23:
• In genetics, for a single - trait, a homozygous genotype has two identical alleles. A dominant allele is typically represented by a capital letter.
• Option A (\(AAaa\)) represents a tetraploid (four - set of alleles) situation for a single trait which is not a simple homozygous dominant.
• Option B (\(AABB\)) represents a genotype for two different traits (both homozygous dominant), not a single trait.
• Option C (\(AA\)) has two identical dominant alleles for a single trait, which is the definition of homozygous dominant for a single trait.
• Option D (\(Aa\)) is heterozygous (one dominant and one recessive allele) for a single trait.
• Option E (\(aa\)) is homozygous recessive for a single trait.
• Question 24:
• Carriers (Option A) of genetic disorders usually have one normal allele and one defective (recessive) allele. In the case of recessive genetic disorders, carriers do not show the traits of the disorder because the normal allele masks the effect of the defective allele.
• Victims (Option B) of a genetic disorder show the traits of the disorder.
• Pedigrees (Option C) are diagrams that show the inheritance patterns of traits (including genetic disorders) in families, not individuals who do not show the disorder.
• Alleles (Option D) are alternative forms of a gene, not individuals.
• Question 25:
• The process by which homologous chromosomes exchange genetic material is called cross - over. It occurs during meiosis (prophase I) and is an important mechanism for genetic recombination.

Answer:

• Question 23: C. \(AA\)
• Question 24: A. Carriers
• Question 25: Cross - over