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Mountain Lion Genetics

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Mountain Lion Genetics

Use B for the dominant brown-fur allele and b for the recessive tan-fur allele. Assume fur colour is controlled by this gene unless a question says otherwise.

Alleles and Fur Colour

1.What is an allele?

One version of a gene
A body part used to find food
A change in an animal’s habitat
A group of different species

2.A mountain lion has genotype Bb. If B produces brown fur and is dominant over b, what fur colour is expected?

Brown
Tan
A mixture of brown and tan patches
The genotype does not provide enough information

3.A Bb mountain lion mates with a bb mountain lion. What percentage of their offspring is expected to have brown fur?

0%
25%
50%
100%

4.Which set lists all the statements that are accurate about inherited traits?

A dominant allele can determine the visible trait when paired with a recessive allele; the environment may affect how some traits develop or appear; a Punnett square can show possible allele combinations in offspring.
A dominant allele can determine the visible trait when paired with a recessive allele; an animal with two recessive alleles shows the dominant trait; every offspring from the same parents must have the same genotype.
The environment may affect how some traits develop or appear; an animal with two recessive alleles shows the dominant trait; a Punnett square can show possible allele combinations in offspring.
A dominant allele can determine the visible trait when paired with a recessive allele; the environment may affect how some traits develop or appear; every offspring from the same parents must have the same genotype.

Predicting Offspring

5.Complete the Punnett square for a cross between two Bb mountain lions. Write the possible offspring genotype in each box.

6.For the Bb × Bb cross, give the expected genotypic ratio in the order BB : Bb : bb.

7.For the same Bb × Bb cross, give the expected phenotypic ratio in the order brown fur : tan fur.

8.Two tan-furred mountain lions with genotype bb have offspring. State the offspring genotype and fur colour expected from this cross.

9.How can two brown-furred mountain lions have a tan-furred offspring? Use allele letters in your explanation.

10.A Bb mountain lion mates with a bb mountain lion. List the possible offspring genotypes and the fur colour associated with each.

11.Sketch two parent mountain lions, labelling their genotypes Bb and bb. Add one possible offspring, then label its genotype and expected fur colour.

Draw and label the two parents and one possible offspring.