You And Your Genes (Inheritance) Flashcards
1
Q
What do you call a egg after it’s been fertilised?
A
A zygote.
2
Q
How many chromosomes are there in an unfertilised egg?
A
23.
3
Q
How many chromosomes are there in a zygote?
A
23 pairs.
4
Q
What are different versions of the same gene called?
A
Alleles.
5
Q
What do homozygous mean?
A
If an organism has two copies of the same allele.
6
Q
What does heterozygous mean?
A
If the organism has one copy of two different alleles.
7
Q
Why do different children in the same family have different features?
A
Because which chromosome we get from each pair is completely random.
8
Q
What is different about the chromosomes a woman has compared to a man
A
females are XX
males are XY.
