Which of the following represents the relative positions of these four genes on the chromosome?

Terms in this set (87)

A diploid cell has 3 pairs of homologous chromosomes designated J1/J2, K1,K2, and L1/L2. Which of the following represents a probable chromosome complement is a haploid cell formed by meiosis:
a) J1 and K1
b) J1 and J2
c) J2, K1, and L2
d) J1, J1, K2, and K2
e) J1, J2, K1, K2, L1, and L2

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In most vertebrates, the sperm cell normally contributes which of the following to the new organism

Most of the cytoplasm of the zygote

Most cells that have become transformed into cancer cells have which of the following characteristics when compared to normal, healthy cells?

Shorter cell cycle

Which of the following best describes the cells that result from the process of meiosis in mammals

They are genetically different from the parent cell

A spermatocyte produces the following four sperm cells

n+1 n+1 n-1 n-1

These cells are the result of nondisjunction during which of the following phases?

Meiosis I

Which of the following is true about the production of polar bodies (gametes) in humans?

It provides the maximum amount of cytoplasm and resources to the ovum

Coat color in mice is determined by genes at two loci. When black mice from a particular population mate, they produce offspring in the following ratios. 9 black: 3 brown: 4 white. These results suggest that white coat color is expressed as a result of:

Epistasis

Which of the following can be diagnosed by examining a karyotype of an individual's white blood cells?

Down syndrome

The relative location of four genes on a chromosome can be mapped from the following data on crossover frequencies

Genes Frequency of Crossover
B and D 5%
C and A 15%
A and B 30%
C and B 45%
C and D 50%
Which of the following represents the relative positions of these four genes on the chromosome?

CABD

Which of the following is the most likely explanation for a high rate of crossing-over between two genes?

The two genes are far apart on the same chromosome

Explain how a single base-pair mutant in DNA can alter the structure and, in some cases, the function of a protein.

Mutations are changes in the genetic material of a cell. In this case, it is a change in the bases A, C, G or T of DNA.

The four levels of protein structure would be altered or denatured. Some of the changes would include active site conformation or oxygen binding.

Explain, using a specific example, the potential consequences of the production of a mutant protein to the structure and function of the cells of an organism.

If it's not doing its job it can prohibit others from doing their job

Cancerous- mess up cell cycle

Cystic fibrosis

When a protein does not fold properly, its function is changed. This can be the result of a single amino acid substitution, such as that seen in the abnormal hemoglobin typical of sickle cell disease.

Describe how the frequency of an allele coding for a mutant protein may increase in a population over time.

More born than will survive, variations in individuals, variations in gene pool, sexual selection, adaptations to environment--->differential reproductive success. It can be passed on from one generation to the next.

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