Genetics: Pass It On Study Guide

What is the definition of phenotype?

• The genetic code of an organism

• The physical expression of a trait in an organism.

• Coiled up strands of DNA.

• A double helix.

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In fruit flies, having wings (W) is dominant to having no wings (w). Would a fly with genotype Ww have wings or no wings?

• Wings

• No wings

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This diagram shows a model of human inheritance.

Key:

A= Dimples (dominant)

a= No dimples (recessive)

What is this model used to determine?

• The likelihood of a trait being passed on.

• The possibility of having triplets.

• Types of mutations.

• The process of meiosis.

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If two parents have brown hair and both parents have a genotype of Bb, how is it possible for them to have offspring with blonde hair?

• An offspring may get one recessive gene from each parent.

• An offspring may get two recessive genes from each parent.

• An offspring may get two dominant genes from each parent.

• It is impossible for them to have blonde offspring.

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A female chicken has black feathers. A male chicken has red feathers. Black is dominant over red feathers in chickens. What is the genotype of the female chicken if she has two chicks and one is black, but the other is red?

• The mother's genotype must be BB

• The mother's genotype must be Bb

• The mother's genotype must be bb

• It is not possible to produce chicks with different colors.

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In horses, the trait for straight fur (F) is dominant over the trait for curly fur (f).

If a purebred, straight haired horse (FF) is mated with a curly haired horse (ff). How many different fur phenotypes are possible?

• 1

• 2

• 3

• 4

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In tomatoes, red color(R) is dominant to yellow (r). A student crosses two tomato plants that are heterozygous for color (Rr).

The student's cross produces one hundred Tomato plants. Of those 100 plants, 78 plants have red fruit, and 22 have yellow fruit. How do the actual results compare to those predicted by the Punnett square?

• The actual results are in error.

• The results are correct. The Punnett square is a predicted ratio of outcomes, not an exact result.

• The cross should be repeated to get more data.

• More tomatoes are needed. The Punnett square cannot predict results for such a small sample size.

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Dimples are a dominant trait (D) inherited on a single gene. No dimples is recessive (d).

A mother and a father both have dimples, but their child does not have dimples (dd). What alleles do the mother and father most likely have?

• Mother DD, father Dd

• Mother dd, father dd

• Mother Dd, father Dd

• Mother DD, father DD

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If a heterozygous yellow (B) butterfly is crossbred with a black (b) butterfly, what percentage of the offspring will be black if yellow is the dominant trait?

• 50%

• 25%

• 0%

• 100%

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