1. A population of lemmings includes two varieties with regards hair colour: those with green hair and those with red hair. A cross was made between a homozygous, green-haired lemming and a homozygous, red-haired rodent. The resulting F₁ generation all had green hair. a. Which colour allele is the dominant one? How do you know?

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1. A population of lemmings includes two varieties with regards hair
colour: those with green hair and those with red hair.
A cross was made between a homozygous, green-haired lemming and a
homozygous, red-haired rodent. The resulting F₁ generation all had green
hair.
a. Which colour allele is the dominant one? How do
you know?
b. If a lemming from the F₁ generation was crossed with a red-haired
lemming, what would be the predicted outcome? Use a genetic cross
diagram or Punnet square to explain your answer.
C. What ratio of offspring would you expect if lemmings from
the F₁ generation were crossed with one another? Explain your
answer
Transcribed Image Text:1. A population of lemmings includes two varieties with regards hair colour: those with green hair and those with red hair. A cross was made between a homozygous, green-haired lemming and a homozygous, red-haired rodent. The resulting F₁ generation all had green hair. a. Which colour allele is the dominant one? How do you know? b. If a lemming from the F₁ generation was crossed with a red-haired lemming, what would be the predicted outcome? Use a genetic cross diagram or Punnet square to explain your answer. C. What ratio of offspring would you expect if lemmings from the F₁ generation were crossed with one another? Explain your answer
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Follow-up Question
Dihybrid crosses and gene interactions
9. As we have already seen, in lemmings, hair colour is determined
by a single gene; in this question we will only consider two
alleles, the green and red alleles. Hair texture is determined by a
second gene with two alleles.
Breeding experiments were carried out giving the following results:
Experiment 1: A green-straight haired male was mated with several
red-curly haired females. All the offspring had green hair that was
straight.
Experiment 2: When the F1 generation from the first experiment
were crossed with one another, there were a total of 79 green-
straight-haired lemmings, 27 red-straight-haired lemmings, 28
green-curly-haired lemmings and 9 red-curly-haired lemmings.
a) Present a logical, step by step explanation of the results of these
two experiments.
b) If a male from the F1 generation was crossed with a female from
experiment 1, what would be the predicted ratios of phenotypes
in the offspring?
c) Suppose that the results in Expt 2 had been 93 green-straight-
haired lemmings, 13 red straight-haired lemmings, 14 green-
curly-haired lemmings and 23 red-curly-haired lemmings. What
conclusion would you make concerning the inheritance of the
given characteristics and why?
Transcribed Image Text:Dihybrid crosses and gene interactions 9. As we have already seen, in lemmings, hair colour is determined by a single gene; in this question we will only consider two alleles, the green and red alleles. Hair texture is determined by a second gene with two alleles. Breeding experiments were carried out giving the following results: Experiment 1: A green-straight haired male was mated with several red-curly haired females. All the offspring had green hair that was straight. Experiment 2: When the F1 generation from the first experiment were crossed with one another, there were a total of 79 green- straight-haired lemmings, 27 red-straight-haired lemmings, 28 green-curly-haired lemmings and 9 red-curly-haired lemmings. a) Present a logical, step by step explanation of the results of these two experiments. b) If a male from the F1 generation was crossed with a female from experiment 1, what would be the predicted ratios of phenotypes in the offspring? c) Suppose that the results in Expt 2 had been 93 green-straight- haired lemmings, 13 red straight-haired lemmings, 14 green- curly-haired lemmings and 23 red-curly-haired lemmings. What conclusion would you make concerning the inheritance of the given characteristics and why?
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Follow-up Question
4. A different population of lemmings have a third allele (i.e. a third
version of the same gene) for hair colour, the blue allele.
a) When pure-breeding red-haired lemmings were crossed with
pure-breeding blue haired lemmings, the offspring all had
purple hair. Using appropriate genetic diagrams, explain the
above result.
b) Predict the offspring and their ratios if the purple-haired
lemmings were crossed
with one another.
Transcribed Image Text:4. A different population of lemmings have a third allele (i.e. a third version of the same gene) for hair colour, the blue allele. a) When pure-breeding red-haired lemmings were crossed with pure-breeding blue haired lemmings, the offspring all had purple hair. Using appropriate genetic diagrams, explain the above result. b) Predict the offspring and their ratios if the purple-haired lemmings were crossed with one another.
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Follow-up Question

Can you have a look at part b I think is wrong??? How all offspring can be heterozygous? 

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