Unit 6 genetics review

Set up the gametes for a dihybrid cross for the parent genotype RrYy

• RY, ry
• RY, Ry, rY, ry
• Rr, Yy
• RY, RY, ry, ry

In the following dihybrid cross, a short tail (S) is dominant to a long tail (s) and brown fur (B) is dominant to white fur (b). What is the fraction of cats that have a short tail and white fur?

• 4/16
• 12/16
• 3/16
• 1/16

Different forms of a gene controlling a particular trait are called

• Codominant
• Heterozygous
• Alleles
• Homozygous

Tags

NGSS.HS-LS3-2

Color blindness is a sex-linked recessive trait (c) carried on the X chromosome. Using the pedigree with the key provided, what is the genotype of person II-4?

• X^CX^c
• X^CX^C or X^CX^c
• X^cX^c
• Not enough information to determine

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If an organism with a homozygous dominant trait was mated in a test cross, all the F1 offspring would be

• homozygous dominant
• homozygous recessive
• heterozygous
• 50% homozygous; 50% heterozygous

Tags

NGSS.HS-LS3-1

A purebred red flower and a purebred white flower are crossed and the offspring produced are all pink. What type of inheritance is this?

• Codominant
• Incomplete dominant
• Basic dominant/recessive
• Multiple alleles

A family has four children and they are all boys. What chance would there be that the next child would also be a boy?

• 75%
• 50%
• 25%
• 20%

Tags

NGSS.HS-LS3-3

A purebred white cow and a purebred red cow mate and the offspring are all roan, which is where the red and white genes are expressed equally. What type of inheritance is this?

• Codominant
• Incomplete dominant
• Basic dominant/recessive
• Multiple alleles

Some traits involve more than two genes, blood type in humans is an example. What type of inheritance is this?

• Codominant
• Incomplete dominant
• Basic dominant/recessive
• Multiple Alleles

The genotype Aa, where there is one dominant and one recessive gene, is called?

• Homozygous recessive
• Homozygous dominant
• Heterozygous
• Codominant