Question

Part A

What is the difference between heterozygous and homozygous individuals?

• Homozygotes have one chromosome while heterozygotes have two similar chromosomes.
• The homozygote will express the dominant trait and the heterozygote will express the recessive trait.
• All of the gametes from a homozygote carry the same version of the gene while those of a heterozygote will differ.
• Heterozygotes carry two copies of a gene while homozygotes only carry one.

Part B

When constructing a Punnett square, the symbols on the outside of the boxes represent___while those inside the boxes represent___

• gametes, parents
• parents, gametes
• gametes, progeny
• progeny, gametes

Part C

True or false? The same phenotype can be produced by more than one genotype.

• True
• False

Part D

True or false? In diploid organisms, a dominant phenotype will only be expressed if the individual is homozygous dominant for that trait.

• True
• False

Answer 1

A). All of the gametes from a homozygote carry the same version of the gene while those of a heterozygote will differ

Example:

AA=homozygote

Aa= heterozygote

B). gametes; Progeny

C). True

The dominant phenotype may be produced by more than one genotype.

AA and Aa produce the same phenotype.

D). False

The recessive phenotype will only be expressed if the individual is homozygous recessive for that trait,

The dominant phenotype will be expressed if the individual is homozygous dominant and heterozygous conditions.