Unit 2 : Variation And Inheritance

Question 1

What is a gene?

Answer 1

Genes are made up of DNA

Question 2

What is an allele?

Answer 2

Different forms of a gene

Question 3

What is a phenotype?

Answer 3

The phenotype of an organism is the physical appearance determined by the genotype for the characteristic.

Question 4

What is a genotype?

Answer 4

The genotype of an organism is the alleles it carries for a particular characteristic.

Question 5

What does a dominant allele mean?

Answer 5

I’d present, will always show up in the appearance of n organism.

Question 6

What does a recessive allele mean?

Answer 6

Will only show up in the appearance of an organism if it has inherited two of this allele.

Question 7

Homozygous?

Answer 7

Two identical alleles

Question 8

Heterozygous ?

Answer 8

One of each type of allele.

Question 9

P? F1? F2?

Answer 9

P = parent
F1 = first gen
F2 = second gen

Question 10

Why are predicted phenotype rations among offspring not not always achieved?

Answer 10

Because it’s completely random what sperm fuses which each egg. It’s a completely random process.

Question 11

What is polygenic inheritance?

Answer 11

A characteristic showing continuous variation and is determined by more than one gene.