19. Individuals having two identical alleles for the same gene/trait (QQ or qq) are …
Dominant
Homozygous
Recessive
Heterozygous
20. What event accounts for the recombination of linked genes?
Mutation
Non-disjunction
Crossing Over
Replication
21. A genetic disease, such as achondroplasia, which only requires one disease allele to be expressed in an individual is said to be a __ disorder.
Heterozygous
Homozygous
Recessive
Dominan
19. Homozygous
Homozygous refers to a particular gene that have identical alleles on both homologous chromosomes. It is referred by two capital letters (XX) for a dominant trait, and two lowercase letters (xx) for a recessive trait.
20. Crossing over
The more is the crossing over the more is the recombination of the linked genes.
21. I think that the last options is dominant not dominan and the answer is dominant.
Achondroplasia is bone growth disorder inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.
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