L20 Flashcards
1
Q
In chickens,…
A
Heterogametic = female
Homogametic = male rooster
2
Q
Hemizygous
A
Can only have one X chromosome
3
Q
Why are females less prone to be affected by X-linked traits?
A
Have an extra X that acts as a safety net, the dominant allele masks the affected recessive allele
4
Q
How many genes in Humans
A
20,000
5
Q
How many linked genes on chromosomes
A
1000 linked per chromosomes
6
Q
Linked genes
A
Fail to seperate during crossing over, cross over together, mostly stay together but some recombinants can occur (crossing over)
7
Q
recombination frequency
A
(recombination no.)/(total no. of gametes)
8
Q
Fewer recombinants mean….
A
The genes are linked
