Dihybrid Cross

Which of the following is a gamete? (check each that apply)

• haploid

• sex cell

• made from meiosis

• diploid

• made from mitosis

Tags

NGSS.HS-LS3-2

Here is a genotype: AaBbcc

Is this a diploid or haploid genotype?

• diploid

• haploid

Here is a genotype: AaBbcc

How many genes are in this genotype?

• 6

• 3

• 2

• 1

Answer explanation

AaBbcc is 3 genes, but 2 alleles each.

You get 2 alleles for each gene in your diploid cells

Check each gamete genotype that can be made from meiotic division (meiosis) of the following genotype:

AaBbcc

• Aa

• Ab

• abc

• ABc

• ABC

Answer explanation

AaBbcc

Each sperm/egg needs 1 allele from each gene of its parent cell.

So you could get A or a, B or b, and for c there is only 1 option

So you could get:

ABc

Abc

aBc

abc

Tags

NGSS.HS-LS3-2

Which of the following zygote genotypes can be created from this cross: AABBCC x aabbcc

• AaBc

• AaBbCc

• aaBBcc

• ABC

Which of the following zygote genotypes can be made from this parent cross:

AABBCc x aabbcc

(check each that apply):

• AaBbCc

• AaBbcc

• aaBBcc

• AaBbCC

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

Mendel used dihybrid crosses as evidence for:

• dominance

• independent assortment

Your mom has brown eyes (genotype = BB) and she has blonde hair (genotype = hh) . Your father has blue eyes (genotype = bb) and he has brown hair (genotype = Hh).

Check each possible phenotype combo that could exist in your new born brother/sister.

• Blond hair and blue eyes

• Blond hair and brown eyes

• Brown hair and blue eyes

• Brown hair and brown eyes

Answer explanation

independently assort alleles to find all possibility

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

How many genes are present?

Aabbccdd

• 4

• 8

How many genotypes can come from this cross:

AABBCC x aabbcc

• 1

• 2

• 3

• 16

Answer explanation

AABBCC x aabbcc

It can only make AaBbCc