Exam 2 Review Flashcards
(Ch 7) For a Mendelian trait, the genotype BB is also referred to as…
homozygous dominant
(Ch 7) How many alleles are needed to represent the genotype of an individual for a trait controlled by three genes?
6
(Ch 7) Cystic fibrosis is a genetic disorder that affects the lungs and is caused by a mutation in the CFTR gene. It is considered a Mendelian trait. Let “L” represent the dominant allele that is associated with not developing cystic fibrosis and “l” represent the recessive allele associated with developing cystic fibrosis.
What is the genotype of a person who has cystic fibrosis?
a) LL
b) Ll
c) ll
d) Ll or ll
c) ll
(Ch 7) Cystic fibrosis is a genetic disorder that affects the lungs and is caused by a mutation in the CFTR gene. It is considered a Mendelian trait. Let “L” represent the dominant allele associated with not developing cystic fibrosis and “l” represent the recessive allele that is associated with developing cystic fibrosis.
Two heterozygous individuals mate, and their first child has cystic fibrosis. What is the probability that their second child will also develop cystic fibrosis? (Hint: Draw a Punnett square.)
25%
(Ch 7) Snapdragon flower color displays incomplete dominance. Therefore, when a homozygous red flower is crossed with a homozygous white flower, the offspring will be…
pink
(Ch 8) Humans have 23 pairs of homologous chromosomes. Select the true statement below.
a) Each chromosome in all pairs is an exact copy of the other chromosome in the pair.
b) Each chromosome in pairs 1–22 is an exact copy of the other chromosome in the pair.
c) Both chromosomes in pairs 1–22 have the same genes at the same loci, but the alleles may be different on the two chromosomes.
d) For females, both X chromosomes are exact copies of one another.
c) Both chromosomes in pairs 1–22 have the same genes at the same loci, but the alleles may be different on the two chromosomes.
(Ch 8) Scientists use a pedigree for what purpose?
To learn about the inheritance of a trait within a family
