Genetics, Meiosis and Mutations

An illustration of how a particular DNA mutation will mostlikely affect the polypeptide produced is shown.

What type of mutation is illustrated?

• insertion

• translocation

• substitution

• deletion

Tags

B.6(E)

When a new mutation occurs in a somatic cell of a sexually reproducing organism, what percentage of the individual's offspring are likely to inherit the mutation?

• 100%

• 75%

• 25%

• 0%

A genetic cross involving two unlinked genes is represented.

AaGG x aaGg

Which genotype is NOT possible in the offspring produced by the cross?

• AaGG

• Aagg

• aaGg

• aaGG

Some angel Fish colors are determined by codominance. Possible phenotypes and genotypes of angel fish colors are shown.

Which table shows the expected phenotypes of offspring resulting from a cross between a black angelfish and a black-lace angelfish?

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A cellular process is shown.

Which statement best describes the significance of this process?

• the process allows organisms to grow and heal

• the process produces clones of the parent organism.

• the process copies DNA before cell division.

• the process creates genetic variation in the resulting cells.

• The event represents RNA translation in the smooth endoplasmic reticulum.

• The event takes place in the bacterial cells

• The event produces genetically identical daughter cells

• The even provides genetic diversity in eukaryotic cells.

Which diagram demonstrates how crossing-over contributes to genetic variety during meiosis?

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Human body cells each have 46 chromosomes in their nuclei. Meiosis is necessary in order to ensure that each gamete produced in the human body has-

• 12 chromosomes

• 23 chromosomes

• 46 chromosomes

• 92 chromosomes

Mice have two unlinked allele pairs that affect fur color. The table shows how allele pairs affect fur color. The term "agouti" describes fur with pigmentation that changes in each hair from the shaft to the tip, giving the fur a banded appearance. Mice with the aa allele pair are albino, regardless of the second allele-pair combination.

What is the probability of albinism in the offspring of a cross between two mice with AaBb

• 1/16

• 3/16

• 4/16

• 9/16

• I-1:aa

  I-2:Aa

• I-1:AA

  I-2:Aa

• I-1:Aa

  I-2:aa

• I-1:aa

  I-2:AA