Inheritance

Question 1

What is an allele?

Answer 1

A version of a gene

Can be dominant or recessive

Question 2

What is the difference between dominant and recessive alleles?

Answer 2

Dominant = always expressed

Recessive = only expressed if both alleles are recessive

Question 3

Define phenotype

Answer 3

Observable characteristic resulting from one’s genotype and its interaction with the environment

e.g someone with green eyes has green alleles

Question 4

Define genotype

Answer 4

Combination of alleles an organism has

(this is like Bb or BB or bB
this is the combination they got one from each parent)

Question 5

What is the difference between heterozygous and homozygous?

Answer 5

Heterozygous = 2 different Alleles e.g bB or Bb

Homozygous = 2 same alleles e.g BB or bb

Question 6

During sexual reproduction, each offspring…?

Answer 6

inherits 2 alleles
one from each parent

Question 7

Why do twins look similar?

Answer 7

They have identical DNA/Genes

they are clones

they came from the same embyro

Question 8

Even though twins have the same DNA why do they look a bit different?

Answer 8

environmental factors

they might have different weights because of their diet

Different hair styles maybe one has tattoos and dyed hair

maybe one has mutation in their DNA