1. In Mendel’s monohybrid cross of purple flowered peas and white flowered peas, all members of the F1 generation were ___________ phenotype because their genotype was ___________ for the flower gene.
A) white flowered; homozygous recessive
B) purple flowered; homozygous recessive
C) purple flowered; heterozygous
D) white flowered; heterozygous
2. An allele is
A) the heterozygote form of a genetic character
B) the recessive form of a gene
C) an alternative version of a gene
D) the dominant form of a gene
3. Human males are much more likely than females to exhibit hemophilia. This is because
A) the gene for hemophilia is carried on the Y chromosome
B) hemophilia is a contagious disease to which males are more susceptible
C) the gene for hemophilia is carried on an autosome
D) the gene for hemophilia is sex-linked
4. A red Angus bull is crossed with a white cow and all of the offspring are a roan color, a shade between red and white. This is an example of genes that are exhibiting
A) codominance
B) incomplete dominance
C) polygenic activity
D) complete dominance
5. Assume that red tomatoes (R) are dominant to yellow tomatoes (r). If a heterozygote red tomato is crossed with a yellow tomato the offspring _____________
A) 50% red, 50% yellow
B) 75% red, 25% yellow
C) all red
D) all yellow
6. Why can we accurately state that men are responsible for the sex of their children?
A) women do not contribute sex chromosomes
B) men can contribute an X or a Y chromosome
C) men can only contribute an X chromosome
D) men can only contribute a Y chromosome
7. The offspring of two different true-breeding pea lines are called (the)
A) P generation
B) F2 generation
C) hybrids
D) characters
8. If two genes are described as “linked genes” they are genes that
A) are on sex chromosomes
B) are far apart on the same chromosome
C) are close together on the same chromosome
D) are on different chromosomes
9. A man who has type B blood and a woman with type A blood could have children with which of the following phenotypes?
A) A, B, AB or O
B) AB only
C) A, B or AB
D) AB or O
10. The crossover percentage between two different genes is
A) dependent on whether dominant or recessive alleles are carried by the two genes
B) equal to the size of the chromosome
C) greater as the distance between the two genes increases
D) greater as the distance between the two genes decreases