Question

#6. Dominant traits are, by definition, always more common in the population than recessive traits. True or False?

#3. Fur color in tribbles is controlled by a single gene which follows simple mendelian rules for genetics. Two homozygous tribbles are bred together: 1 white and 1 black. All of the offspring have black fur. Which trait is the dominant trait?

Impossible to tell with the given information

Black fur

White fur

Neither of the traits would be dominant

#18. A punnett square predicts a phenotypic ratio of 3 orange : 1 blue. What does this really mean?

That these parents could only ever have 1 blue offspring

That there is a 25% chance that each offspring might be blue

That the parents will have exactly 3 orange offspring and 1 blue offspring

That the first three children will definitely be orange

Answer 1

6. False. Explanation- Dominant traits are expressed by suppressing the recessive alleles. However, this has nothing to do with the frequency of alleles in a population.

3. Black fur. Explanation- When two homozygous individuals are crossed to produce a heterozygous offspring, the phenotype of the heterozygous individual is the dominant phenotype i.e. the trait that got expressed in heterozygous condition is a dominant trait.

18. That there is 25% chance that each offspring might be blue. Explanation- When a monohybrid cross shows 3 orange : 1 blue ratio, it means that there is 75% chance of their offspring being orange and 25% chance of their offspring being blue. This doesn't mean that out of 4 offsprings, certainly 3 will be orange and 1 will be blue.

Thanks