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Inheritance

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Question 19

Hamsters can have rough coats or smooth coats. The allele for rough coat (RRR) is dominant to the allele for smooth coat (rrr).

A homozygous rough-coated hamster mated with a homozygous smooth-coated hamster to produce the first generation of offspring.

a.

State the genotypes of: (i) the rough-coated parent (ii) the smooth-coated parent (iii) the first generation offspring

[3]
b.

The first-generation hamsters mated with each other to produce a second generation. List the possible gametes produced by the first-generation parents, and state the genotypes of the possible second-generation offspring.

[2]
c.

The passage below describes part of the process of reproduction in hamsters. Identify the correct biological terms for the blank spaces (i) to (vi).

"The male hamster produces gametes called (i) _\text{_____________}_ that swim to the female gamete. Each gamete has the haploid number of chromosomes, which is 22 in hamsters. The gametes join in a process called (ii) _\text{_____________}_. The single cell produced is called a (iii) _\text{_____________}_ and contains the (iv) _\text{_____________}_ number of chromosomes. This cell divides by (v) _\text{_____________}_ into an embryo. Each cell in the embryo contains (vi) _\text{_____________}_ chromosomes."

[6]

Inheritance Questions

  1. IGCSE
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  3. /Inheritance