Genetic Diagrams p7

Question 1

What are different versions of the same gene called?

Answer 1

Alleles

Question 2

What are gametes?

Answer 2

In sexual reproduction, the mother and the father produce gametes (reproductive cells), sperm and egg.

Question 3

What genetic information is in a gamete?

Answer 3

Each gamete only has one copy of each chromosome, so gametes only have one version of each gene (I.e. one allele)

Question 4

What happens if the alleles are different?

Answer 4

Then the organism has instructions for two different versions of a characteristic but it one shows one version.

Question 5

Which allele is responsible for the version of the characteristic that appears?

Answer 5

The dominant allele.

Question 6

What is the allele called for characteristics that are shown?

Answer 6

Recessive allele.

Question 7

What must happen for a characteristic caused by a recessive allele to be shown?

Answer 7

The characteristic caused by the recessive allele only appears if both alleles are recessive.

Question 8

What are genes represented by in genetic diagrams?

Answer 8

Letters

Question 9

What type of letter shows a dominant allele in a genetic diagram?

Answer 9

Capital letter

Question 10

What type of allele does a small letter represent in a genetic diagram?

Answer 10

A recessive allele

Question 11

What does it mean if you are homozygous for a trait?

Answer 11

You have two alleles the same for that particular gene (e.g. CC or cc)

Question 12

What does it mean if you are heterozygous for a trait?

Answer 12

You have two different alleles for that particular gene (e.g Cc)

Question 13

What is an organisms genotype?

Answer 13

The alleles it has

Question 14

What is an organisms phenotype?

Answer 14

The characteristics it displays

Question 15

See page 7 for genetic diagrams and for the question about genetic diagrams.

Answer 15

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