Q1. Tay-Sachs is the recessive genetic disease in humans. If one parent is homozygous normal and other is a carrier (that is, heterozygous), what are the chances which their child will encompass this disease?
A. 0%
B. 25%
C. 50%
D. 75%
E. 100%
Q2. If an organism exhibits a recessive phenotype, like short pea plants, it can be:
A. either TT or Tt.
B. either TT or tt
C. only Tt.
D. TT, Tt, or tt
E. only tt.
Q3. In humans, suppose red hair is recessive to the dark hair. Illustrate the chances of a dark haired couple containing a red-haired child if each had one red-haired parent?
A. 0
B. 25%
C. 50%
D. 75%
E. 100%
Q4. If the genotype of organism is YySsTt, then yST would symbolize:
A. The genotype of offspring.
B. A gamete of that parent organism.
C. Possible phenotype of the offspring.
D. Possible zygote.
E. P generation.
Q5. In guinea pigs, B = black, b = brown, S = short hair, s = long hair. A dihybrid reproduces with dihybrid. The expected outcomes are:
A. 9 black long hair, 3 black short hair, 3 brown long hairs, one brown short hair.
B. 9 black short hair, 6 black long hair, 3 brown long hair, one black short hair.
C. 9 black short hair, 3 black long hair, 3 brown short hairs, one brown long hair.
D. 9 brown short hair, 3 black long hair, 3 brown long hairs, one black short hair.