Pre AP Genetics II

What is the number of chromosomes in a somatic cell of a mouse?

• 19

• 20

• 38

• 40

Based on the karyotype, which of the following would be a reasonable statement about the production of gametes in mice?

• At the end of the DNA synthesis during interphase, the mouse cells would have over 100 individual chromosomes.

• During metaphase II of meiosis, each cell would have 20 individual chromosomes and 40 chromatids.

• By the end of cellular division by mitosis, each gamete would have 20 pairs of homologous chromosomes.

• The last step of meiosis II is cytokinesis, which results in four gamete cells each having 40 individual chromosomes.

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Based on the nature of meiosis and information about the mouse genome, which of the following is an accurate model and description of anaphase II?

• 40 homologous chromosomes align in the center of the cell

• 20 chromosomes with sister chromatids align in the center of the cell.

• 20 chromosomes separate their sister chromatids and move to opposite sides of the cell.

• 20 homologous chromosomes separate and move to opposite sides of the cell.

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Which individuals demonstrate that sickle cell is recessive?

• #11 is the child of #6 & #7

• #1 and #2 have no children with the disorder

• #3 and #4 have 2 children with the disorder

• More boys have it than girls

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Which individuals should be half-shaded as carriers?

• # 10

• # 4

• # 5

• # 8

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What is a danger to a population that reproduces asexually?

• They can't reproduce fast enough.

• They have too much variety in their genes.

• Since they have the same immunity, one disease can wipe them all out.

• They can become adapted to the environment

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Achondroplasia is the most common form of dwarfism in miniature horses. Achondroplasia dwarfs have normal sized bodies and heads, but noticeably smaller upper legs and ears. This form of dwarfism is an autosomal dominant trait. The pedigree shows the offspring of one horse without dwarfism, Individual 1, and one with dwarfism, Individual 2. The horses with achondroplasia are shaded black.

Which of the following is the correct pairing of phenotype and genotype of Individual 1 in the pedigree?

• Dwarf, Homozygous dominant

• Dwarf, Heterozygous

• Non-Dwarf, Homozygous recessive

• Non-Dwarf, Heterozygous

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Achondroplasia is the most common form of dwarfism in miniature horses. Achondroplasia dwarfs have normal sized bodies and heads, but noticeably smaller upper legs and ears. This form of dwarfism is an autosomal dominant trait. The pedigree shows the offspring of one horse without dwarfism, Individual 1, and one with dwarfism, Individual 2. The horses with achondroplasia are shaded black.

Based on the pedigree, which of the following is an accurate claim with evidence about the genotype of Individual 2?

• Homozygous dominant

• Heterozygous

• Homozygous recessive

• Dwarf

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Achondroplasia is the most common form of dwarfism in miniature horses. Achondroplasia dwarfs have normal sized bodies and heads, but noticeably smaller upper legs and ears. This form of dwarfism is an autosomal dominant trait. The pedigree shows the offspring of one horse without dwarfism, Individual 1, and one with dwarfism, Individual 2. The horses with achondroplasia are shaded black.

If Individual 5 mated with a homozygous dominant horse, which of the following would be a valid prediction about the offspring?

• All offspring would be dwarf

• All offspring would be homozygous, non-dwarf

• Half of the offspring would be dwarf

• All offspring would be non-dwarf

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Blood type in humans has three alelles: A, B, and O. A and B are both dominant to O. Therefore, there are two ways to have Type A blood:

• AA and AO

• BB and BO

• AB and AA

• AB and BB

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