Question

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Answer 1

1) Sex in humans is determined by the type of male haploid gamete that fuses with the female egg. The chromosome in the 23rd pair of a male gamete can be either X or Y. The female egg always has an X chromosome.

When the male gametes with the X chromosome and fuses with the female egg then the child will be female. Similarly when the male gamete with the Y chromosome and fuses with the female egg then the child will be male.

2) A phenotypic ratio is a quantitative relation between phenotypes showing the number of times the frequency of one phenotype correlates with another. When a researcher would like to obtain the gene expression for generations of an organism, they use the phenotypic ratio obtained from a test cross.

3) In the picture

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