1. A population of lemmings includes two varieties with regards haircolour: those with green hair and those with red hair.A cross was made between a homozygous, green-haired lemming and ahomozygous, red-haired rodent. The resulting F₁ generation all had greenhair.a. Which colour allele is the dominant one? How doyou know?b. If a lemming from the F₁ generation was crossed with a red-hairedlemming, what would be the predicted outcome? Use a genetic crossdiagram or Punnet square to explain your answer.C. What ratio of offspring would you expect if lemmings fromthe F₁ generation were crossed with one another? Explain youranswer

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Description: 1. A population of lemmings includes two varieties with regards haircolour: those with green hair and those with red hair.A cross was made between a homozygous, green-haired lemming and ahomozygous, red-haired rodent. The resulting F₁ generation all

Gregor Mendel was an Austrian scientist, mathematician, and biologist who proposed laws of…

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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

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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.

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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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