Download Genetics Mixed

Name
Per
Date
Mixed Genetics
Problems
1.
2.
3.
4.
5.
The genes for dark eyes (black and brown) usually dominate over genes for
blue or gray eyes. A man with black eyes marries a woman with light gray
eyes. They have two children, a boy with black eyes, and a girl with blue eyes.
What are the genotypes of the man, his wife, the little boy and the little girl?
A man with brown eyes marries a woman with blue eyes. They have 12
brown-eyed children. What are the genotypes of the man, his wife, and all the
children?
6.
If two black mice are crossed, ten black and three white mice result.
a.
Which allele is dominant?
b.
Which allele is recessive?
c.
What are the genotypes of the parents?
7.
A man with the type AB blood marries a woman with the type O blood, but
whose father was type A blood. What genotype would you expect their first
child to have?
8.
A man with type B blood marries a woman with the type A blood. They have six
type AB children. What are the genotypes of the father, mother, and children?
9.
A man with type A blood marries a woman with type B blood. They have a type
O child. What is the probability of their fifteenth child having type O blood?
A man and a woman have 24 children. Of the children, 17 have brown eyes
and 7 of the children have blue eyes. What are the genotypes of the parents?
A heterozygous rabbit is crossed with a homozygous dominant rabbit. What
are the results?
(B = gray b = white).
Assume that the dimple is inherited as a simple dominant gene. A dimpled
man whose mother has no dimple marries a woman with no dimple. What is
the probability that they will have a child with a dimple?
Name
10. A man with a dimple and brown eyes (whose father had blue eyes but no
dimples) marries a woman with a dimple and brown eyes (whose father had
blue eyes with no dimple). What is the probability their first child will be blueeyed and without a dimple? (Assume that dimple is a dominant over smooth
cheeks, and brown eyes are dominant over blue).
Per
Date
14.
A homozygous female is bred to a heterozygous male. Color is incomplete for
dominance in these gerbils. D = dark brown d = white. Heterozygous phenotype
is Tan. What would the results of the cross be?
15.
Taylee is homozygous dominant for type A blood. Her father was type A blood,
but heterozygous. Her mother is also type A heterozygous. What are the
probabilities for Taylee’s older brothers blood type.
11. A blue-eyed woman with no dimple marries with brown eyes and a dimple
(whose mother had blue eyes and no dimple). What is the probability that
their first child will have blues eyes and a dimple?
12. Tongue rolling is a dominant trait. Can a husband and wife that are not able to
roll their tongues produce a child that is able to roll his or her tongue?
13. The flowers of snapdragons are dominant in red (R) and recessive in white (r).
Snapdragons also display incomplete dominance of pink when heterozygous.
A pure red snapdragon is crossed with a pure white snapdragon. What are the
genotypes and phenotypes of this cross?
16. In watermelons, the alleles for green color (G) and short shape (S) are dominant.
Striped color and long shaped are recessive. A plant that is long and striped is
crossed with a plant that is heterozygous for both traits. What are the possible
genotypes and phenotypes for the offspring?
17. A father with brown hair (Hh) and brown eyes (Bb) marries a woman with brown
hair (Hh) and blue eyes (bb). What is the chance they will have a blonde haired,
blue-eyed baby?
18. In purple people eaters, 2 horns are dominant (H) and no horns is recessive. If a
purple people eater is a heterozygote then it has 1 horn. Two heterozygote
purple people eaters are about to have a baby. What are the genotypes and
phenotypes that their baby could possess?