Story of Us

Question 1

Give the definition of gene?

Answer 1

A section of DNA that codes for a protein

Question 2

Give the definition of Allele?

Answer 2

A particular form of a gene

Question 3

Give the definition of Homologous Chromosomes?

Answer 3

A pair of chromosomes, one inherited from each parent, that have the same genes

Question 4

Give the definition of Dominant?

Answer 4

This allele will always be expressed

Question 5

Give the definition of Recessive?

Answer 5

This allele will not always be expressed

Question 6

Give the definition of genotype?

Answer 6

Expressed characteristics of the genome

Question 7

Give the definition of phenotype?

Answer 7

The DNA present in every cell of that organism

Question 8

Give the definition of homozygous?

Answer 8

When the nucleus carries the same allele on both members of the homologous pair

Question 9

Give the definition of heterozygous?

Answer 9

When the nucleus carries different alleles on each member of the homologous pair

Question 10

What are the chemical elements that make up DNA?

Answer 10

Nitrogen, Phosphate, Carbon

Question 11

How do the complimentary bases work?

Answer 11

C only binds with G
T only binds with A

Question 12

Give the definition of Codominance?

Answer 12

Alleles A and B are equally expressed to the recessive allele

Question 13

In mice, black fur is dominant (F) to brown coloured fur (f). A heterozygous female mates with a homozygous black male. Show this on a cross diagram.

Answer 13

100% Black Fur

Question 14

The gene for wavy hair is dominant over the gene for straight hair. What percentage of offspring will have wavy hair when a heterozygous female marries a man with straight hair?

Answer 14

50% straight
50% Wavy

Question 15

Horses hair colour is coded by 2 alleles. One for white hair (CW) and one for red hair (CR). When crossed the offspring has a roan colour. The female and male are homozygous. Show how many offspring will be roan coloured?

Answer 15

All offspring