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Genetic Crosses
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Slide 11

Punnett Square

Punnett Square

Another method of showing crosses

Slide 12

Gamete genotypes are inserted

Gamete genotypes are inserted

Parent genotypes are inserted B=black b=white

Bb male black

bb white female

B

b

b

b

What are the crosses

Bb

bb

Bb

bb

2 white and 2 black offspring

50:50 chance with these parents

Slide 13

Question

Question

2 black rats are mated, they have 13 offspring. All of which are black, what are the genotypes of the parents

The male is re-mated with a white female, the offspring are

6 black and 7 white

What were the genotypes of the original parents

Rats have 2 coat colours black B, white b.

Both BB BB

BUT

one could be Bb

Female BB Male Bb

Slide 14

Remember think how lucky you are!

Remember think how lucky you are!

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