Topic 5.3

When a person has two different alleles for a gene, they are said to be

• heterozygous
• homozygous

In watermelons, green rinds (G) are dominant to striped rinds (g). What is the genotype of a heterozygous green watermelon?

• GG

• Gg

• gg

• green

Answer explanation

Correct! Heterozygous genotypes have one dominant and one recessive trait. In this case, that would be Gg.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

One of the two forms of a gene is called a(n)

• genotype

• allele

• hybrid

• trait

Answer explanation

Correct! Alleles are a version of a gene. For example, if there was a gene that coded for hair color, versions (alleles) of that gene could be brown, black, red, blonde, etc

Tags

NGSS.HS-LS4-3

Aa, DD, Bb, yy are all examples of

• genotypes

• phenotypes

Answer explanation

Correct! Genotypes are the genes an organism has that help code for proteins giving the phenotype (physical expression of the trait)

Which of the following genotypes is homozygous dominant?

• A

• Aa

• AA

• aa

Answer explanation

Correct! Homozygous refers to alleles that are the same. But dominant tells us that the alleles are both the dominant trait (represented by a capital letter)

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

If one allele for a trait is dominant and the other allele is recessive, which trait will be visible? The dominant allele or the recessive allele?

• Dominant will be visible because it is blocked by the recessive allele.

• Dominant will be visible because it hides or blocks the recessive allele.

• Recessive will be visible because it is blocked by the dominant allele.

• Recessive will be visible because it hides or blocks the dominant allele.

Tags

NGSS.HS-LS3-1

This type of inheritance pattern is a MIXTURE of both traits, like the old theory of blending

• incomplete dominance
• co-dominance
• complete dominance
• recessive pattern

This type of inheritance pattern shows BOTH traits in possible offspring:

• complete dominance
• incomplete dominance
• co-dominance
• Indomitable 

When two or more genes control one single trait.

• Multiple Alleles
• Several Genes
• Polygenetic Traits
• Genotype

Tags

NGSS.HS-LS4-3