PEDIGREES, PUNNETT SQUARES AND VOCABULARY TEST CORRECTIONS

QUESTION 3

How many mothers in the pedigree have the sca trait?

ANSWER: 1

QUESTION 4

Which generations does the sca trait appear in?

ANSWER: 3,4

QUESTION 6

How is it possible for child #2 in the third generation to have SCA when their parents and grandparents don't show the trait?

ANSWER: If both parents are heterozygous (Ss) then the offspring has a chance of showing the trait.

QUESTION 8

Select the statements that are true from the list below.

ANSWER: Correct answer

There a 5 mating / married relationships in the pedigree above

Generation 4 has SCA because of the 1st generation on the pedigree

Generations 1 and 2 are carriers of the SCA trait.

QUESTION B:

What is the correct genotype for the square labeled with 2.

ANSWER: Bb on row box 2

QUESTION C:

What is the correct genotype for the square labeled with 3.

Correct answer: bb

QUESTION F

What percentage of the offspring are homozygous dominant?

Correct answer: 0%

QUESTION H

Which numbers of the punnett square will cause a phenotype of blonde hair?

Correct answer: 3,4

QUESTION H

Which numbers of the punnett square will cause a phenotype of brown hair?

Correct answer: 1,2

A ___________________ causes a recessive trait to be expressed or shown in an individuals phenotype.

Correct answer

Recessive gene

Homozygous recessive genotype

MULTIPLE ANSWERS ARE POSSIBLE

____________________ is/are a cause/reason for different eye colors

Correct answer

Genetic Variation

Alleles

Genes

MULTIPLE ANSWERS ARE POSSIBLE

A genotype that is written like (Aa) tells us that..

Correct answer

The individual carries a recessive allele

The genotype will cause a dominant trait to be expressed in the phenotype

A heterozygous genotype is written