Reference no: EM132610683

ASSIGNMENT

1) In pea, tall plant and axial flowers are dominant over dwarf plants and terminal flowers. A cross between a tall pea plant with axial flowers and a dwarf plant with terminal flowers resulted in following offspring- 30 tall, axial flowers; 27 tall, terminal flowers; 28 dwarf, axial flowers and 29 dwarf, terminal flowers. What are the genotypes of the parents? Use Punnett Square to confirm your answer.

2) In tomatoes, red fruit is dominant to yellow fruit, and purple stems are dominant to green stems. The progeny from one mating consisted of- 305 red fruit, purple stem; 328 red fruit, green stem; 110 yellow fruit, purple stem and 97 yellow fruit, green stem. What could be the genotype of the parents in this cross? Use Punnett Square to confirm your answer.

3) A child has blood group O. If the father has blood group A and mother blood group B, what could be the genotypes of the parents and the possible blood groups of other children?

4) If the father have blood group AB and mother have blood group B, the blood group not possible in their son would be ? Explain using a genetic cross.

5) Design an experiment to test the hypothesis ‘crossing-over during meiosis occurs between non-sister chromatids of a homologous pair of chromososmes'.

6) What sex ratio would you expect among the offspring of a cross between a normal male mouse and a female mouse heterozygous for a recessive X-linked lethal gene?

7) A color blind woman marries a normal man. What proportion of their sons and daughters will be color bind?

8) A woman has a rare abnormality of the eyelids called ptosis, due to which she cannot open her eyes completely. This is because of a single dominant gene P. The woman's father had Ptosis but mother had normal eyelids.
a. What are the possible genotypes of the woman, her father and her mother?
b. What proportion of her children will have Ptosis if she is mated with a normal man?