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Flashcards in Peerwise Deck Deck (14)
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1

How to work out number of sperm + egg?

2^number of heterozygous loci

2

What is the number of F2 genotypes?

3^number of heterozygous loci

3

A test cross is used to...

Determine whether an individual expressing the dominant phenotype is homozygous or heterozygous

4

Work out gene order in a trihybrid cross

Look at 2 double recombinants and gene that's changed is the one in the middle

5

To determine map distance

1. Deal with each loci in pairs
2. Identify recombinant classes
3. Distance between two loci = Number of recombinants between 2 loci / total number of offspring X 100

6

In genetic linkage :

A deficiency of recombinant genotypes in the gametes

7

Acrocentric

Off-Centre centromere

8

If autosomal linkage

Only through female lineage

9

Coat colour in the mouse serves as a good example of

Epistasis

10

Y-linked

Genes located on the Y-chromosome and appearing only in males

11

Sex limitation

The same allele has different expressions in male and female individuals.

12

Achondroplasia is an

Autosomal dominant disease

13

Atavism

Phenotypic traits disappearing and then reappearing later in the phylogenetic tree.

14

Equation to work out probability in more than 1 scenario

P(k out of n) = n! / (k!(n-k)! x p^k x q^(n-k)

- > where p = probability of occurrence and q= probability of non-occurence
- k = number of times outcome p occurs