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Biblioteka

Genetics Practice #1

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Answer the questions below. If you need some help, GO TO Punnett Square Google Slides Presentation.

Answer the questions below. If you need some help, GO TO Punnett Square Google Slides Presentation.

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Complete the Punnett squares for each of the crosses.

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Crosses and Punnett squares can also be used to predict genotypes of the parents. Doing this intentionally to determine parental genotypes is called a "testcross".

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In another laboratory, a short haired guinea pig is crossed with a long haired one, and over the course of several years, not a single offspring has long hair. Show the cross that explains this situation.

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Pitanje 1
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For each genotype below, indicate whether it is heterozygous or homozygous.

  • Bb

  • Dd

  • Pp

  • HH

  • AA

  • ff

  • Ee

  • gg

  • heterozygous

  • homozygous

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Pitanje 4
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Tall (T) plants are dominant to short (t).

Tt x tt. Show what you should write in each box if the Heterozygous individual is on the top two boxes.

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Pitanje 13
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Purple-flowered (P) plants are dominant to white-flowered plants. (p).

Pp x Pp. Show what you should write in each box if you cross two heterozygous individuals.

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Pitanje 22
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Pitanje 23
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Yellow peas are dominant to green peas.

A Pea plant homozygous for yellow peas is crossed with one that produces green peas.

How many of the offspring plants will be hybrids that are heterozygous?

In guinea pigs, the allele for short hair is dominant to long hair.

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Pitanje 24
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Pitanje 26
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Also in guinea pigs curly hair is dominant to straight.

Show the cross between two homozygous curly haired guinea pigs.

What would be the chances of getting a straight-haired offspring?

Pitanje 27
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If two plants with purple flowers have offspring that show white flowers, which of the following must be true?

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