Please help prepare me These questions are to guide your studying. They do not c

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Please help prepare me

These questions are to guide your studying. They do not cover all of the topics that may be on exams. Explain why there are approximately 50% males and 50% females in the human population. A man and woman have five children all boys. They are expecting a sixth child. What is the probability that this child will also be a boy? A male fruit fly is heterozygous for an autosomal gene affecting body color. Explain why this fly makes four genetically distinct types of gametes, if the sex chromosomes are also considered. Work out the genotypic and phenotypic proportions of the F_2 generations for the reciprocal crosses of Morgan's red-eyed and white-eyed flies. In humans, red-green colorblindness is a recessive, X-linked condition. A colorblind man marries a phenotypic ally normal woman whose father was colorblind. What are the possible genotype and phenotypes, and their relative proportions, expected in their children? An F_1 dihybrid animal produces 50% parental and 50% recombinant gametes for two genes. Do these genes assort independently? Can you say whether these genes are on the same or different chromosomes? What is a testcross? For the testcross on page 3, draw a diagram showing how a recombinant b vg chromosome is made by a crossover in the testcross shown on page 3. What if two crossovers occurred between the two genes instead of just one? Would recombinant or parental gametes result? The human Y chromosome does have at least one important gene that is not present on the X chromosome. What is the function of this gene?

Explanation / Answer

Answer:-

1)Explain why there are approximately 50 percent male and 50 percent female in human population

2)A human being has only two chromosomes, X and Y. The females have XX while the males have XY. During meiosis, when the gametes meet, only one chromosome is gotten as the cell divides; an X in each egg and either a Y from the sperm or another X equally. Therefore, a new pair is created, which is XX or XY. Thus, 50 percent XX and 50 percent XY

A man and a woman have five children, all boys. They are expecting a sixth child. What is the probability that this child will also be a boy?

The gender of the child is normally 50 percent for a male and 50 percent for a female. However, a couple that has five children who are both male, the probability of them having another male is 1/5.

First boy=1/5

Second boy=1/5

Third boy =1/5

Fourth boy=1/5

Fifth boy=1/5. Therefore, a fifth is the probability of the couple having a boy child.

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