Reproduction & Inheritance

Question 1

Mitosis and meiosis are both forms of nuclear division involved in reproduction.

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Question 2

In tomato plants, fruit colour is controlled by a single gene. The allele for red fruit is dominant to the allele for yellow fruit. Two plants that both produce red fruit were bred together. The cross produced 74 offspring with red fruit and 24 offspring with yellow fruit.

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Question 3

Red-green colour blindness is a sex-linked condition in humans. The gene is found on the X chromosome. The allele for normal colour vision (Xᴮ) is dominant to the allele for colour blindness (Xᵇ).

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Question 4

The menstrual cycle prepares the body for pregnancy and is controlled by hormones. Fig. 4.1 shows the changes in the concentration of two hormones, Y and Z, during one 28-day menstrual cycle.

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