Anchor 6a Genetics - Mendelian Genetics & Punnett Squares

The table below gives information about the feather color phenotypes of parents and offspring for several different crosses of turkeys. Each parent turkey is true-breeding (homozygous) for its feather color.

Based on the results of the crosses, which of the following statements best describes how alleles for feather color interact?

• The bronze allele is recessive to the black allele and the red allele.

• The red allele is dominant to the black allele and the bronze allele.

• The black allele is dominant to the bronze allele and recessive to the red allele.

• The bronze allele is dominant to the red allele and recessive to the black allele.

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Suppose a trait is controlled by a gene that has one dominant allele (G) and one recessive allele (g).

Which of the following crosses would be expected to produce the greatest variety of genotypes among the offspring?

• GG × GG

• GG × gg

• Gg × Gg

• Gg × gg

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Hawaiian happy face spiders from the island of Maui can have different markings, as shown below. A single gene determines the markings on the spiders.

A plain spider is crossed with a patterned spider. The patterned spider is homozygous. The pattern allele is dominant to the plain allele.

What percentage of the offspring from this cross are expected to be patterned instead of plain?

• 0 percent

• 25 percent

• 50 percent

• 100 percent

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Fruit flies have hair-like bristles on the back side of their bodies. The bristles can be long or short. Flies with short bristles have two recessive alleles (ss) for the trait. A fruit fly that is heterozygous for the bristle trait is crossed with a fruit fly that has short bristles. The cross produces 220 offspring.

How many of the offspring are expected to have short bristles?

• 0

• 55

• 110

• 220

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The inheritance patterns for some traits in guinea pigs are listed in the table below.

1. Identify the phenotype of a guinea pig with the genotype HhBBrr.

2. Using the allele symbols in the table, identify the genotype of a guinea pig that is recessive for hair length, heterozygous for hair color, and homozygous dominant for hair texture.

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In Mendel's law of segregation, alleles sort _____ because the gene is located on a specific _____ .

• independently; chromosome

• in pairs; chromosome

• independently; gamete

• in groups; gamete

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The law of independent assortment states that:

• The alleles of two genes sort into the gametes independently of the alleles of another two gene

• The alleles of one gene sort into the gametes independently of the alleles of another gene

• The gametes of one gene sort into the alleles independently of the gametes of another gene

• The genes of one organism sort into the gametes independently of the genes of another organism

Mendel's study of what plant eventually revolutionized the understanding of heredity?

• Tomato plant

• Pea plant

• Pepper plant

• Bean plant

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Alleles A and B are linked on chromosome 1 (such that you have A-B and a-b). Alleles C and D are linked on chromosome 2 (you have C-D and c-d). If a crossover event does not occur between either set of genes, which gamete genotype could NOT be produced by an individual heterozygous at each locus?

• A-B; C-d

• a-b; c-d

• A-B; c-d

• A-B; C-D

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When an organism is diploid, that means it has _____.

• One version of each chromosome.

• Two versions of each chromosome.

• No chromosomes.

• Chromosomes from only one parent.