Genetics Unit 5 Review

Polydactyly is an inherited disease. The allele for Polydactyly (P) is dominant to the affected allele (p). If a person who is homozygous dominant has children with a person who is homozygous recessive, what percentage of their children will likely have Polydactyly.

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The inheritance pattern for the trait of widow's peak is shown in the pedigree. Shaded symbols represent individuals that express the dominant trait.

Based on this pedigree, which individual has the genotype "Aa"?

• I-1

• II-2

• II-4

• II-5

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In humans, the allele for brown eyes is (B), and the allele for blue eyes is (b).

When two heterozygous parents are crossed, what percentage of the offspring is expected to be heterozygous?

• 50%

• 0%

• 75%

• 25%

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The chart shows the genetic control of feather color in chickens.

Which punnett square represents a cross that would produce a brown offspring?

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Angelfish colors follow the non-mendelian inheritance rules of co-dominance. The image shows possible phenotypes and genotypes for angelfish. What would be the expected percentage of a cross between a black angelfish and a silver angelfish?

• Silver = 50%

  Black lace = 0%

• Black lace = 100%

• Black lace = 75%

  Silver = 25%

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Both parents have different (a)   and this will possibly cause one sibling to express the dominant trait while another expresses the recessive trait. ​ ​

• alleles
• chromosomes
• phenotypes
• ancestry

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What is the phenotype of the hamster's offspring labeled with the X in the dihybrid cross shown?

• Brown, dancing

• Blonde, not dancing

• Blonde, dancing

• Brown, not dancing

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Widows peak is dominant over a straight hairline. Choose the best explanation as to why the majority of offspring had more straight hairlines then the widow's peak.

• One parent provided dominant genes and one parent provided recessive genes

• Genes from both parents were dominant

• Each parent provided both dominant and recessive genes in equal numbers

• Genes from both parents were recessive

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In humans, Brown eyes are dominant over blue eyes. If one parent is homozygous for brown eyes (BB) while the other parent is homozygous for blue eyes (hh), what is the probability(%) that the offspring of these parents will have blue eyes?

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Two traits were observed for humans: hair color and hair line. For color, Brown (B) is dominant over blonde (b). For hair line, widows peak (W) is dominant over straight hair line (w). What is the genotype for a heterozygous Brown hair widow's peak offspring?

• BBWW

• BbWW

• WwBb

• BbWw

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