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Unit Test — Unit test Answers

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A plant that has round and yellow seeds (RrYy) is crossed with a plant that has round and yellow seeds (RrYy). What is the ratio of the offspring that will have round and yellow seeds?Key: R = round r = wrinkled Y = yellow y = green

1:16

3:16

8:16

9:16

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In roses, red flowers and long stems are dominant traits. A rose plant that is homozygous for both red flowers and long stems is crossed with a rose plant that is heterozygous for red flowers and homozygous for short stems. What percentage of the offspring will exhibit red, long-stemmed flowers?

25 percent

50 percent

75 percent

100 percent

Joyce and Tim started piano lessons at the same time. They both practice about 30 minutes a day and enjoy playing the piano. Despite these similarities, Joyce has mastered many more piano skills than Tim has. Which argument is best supported by these observations?

All individuals inherit the same potential to play the piano.

The ability to play the piano is influenced by genetics as well as the environment.

The amount an individual practices each day entirely determines how well they play piano.

Most people only need 30 minutes of piano practice each day to master skills.

The diagram represents a dihybrid cross between two pea plants heterozygous for both seed color and seed shape.What is the phenotypic ratio of the offspring?

1:1:1:1:2:2:2:2:4

1:3:3:9

1:4

4:12

A cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. Purple offspring result due to incomplete dominance. Then, two of the purple offspring are crossed. What proportion of the offspring from the second cross will be purple?

1 in 4

2 in 4

3 in 4

4 in 4

Laura's mother is shown in the image. Which trait is Laura least likely to inherit from her mother?

brown eyes

pink hair

unclefted chin

no freckles

The Punnett square predicts the ratio of genotypes in the offspring based on the genotypes of the parents. Which Punnett square represents a cross between a mom who is heterozygous for dimples and a dad who is homozygous for no dimples?

A Punnett square is shown. The columns are labeled Upper D and Upper D. The rows are labeled d and d. Clockwise from upper left the boxes contain: Upper D d, Upper D d, Upper D d, Upper D d.

A Punnett square is shown. The columns are labeled Upper D and d. The rows are labeled d and d. Clockwise from upper left the boxes contain: Upper D d, d d, d d, Upper D d.

A Punnett square is shown. The columns are labeled Upper D and d. The rows are labeled Upper D and d. Clockwise from upper left the boxes contain: Upper D Upper D, Upper D d, d d, UpperD d.

A Punnett square is shown. The columns are labeled Upper D and Upper D. The rows are labeled Upper D and Upper D. Clockwise from upper left the boxes contain: Upper D Upper D, Upper D Upper D, Upper D Upper D, Upper D Upper D.

Cystic fibrosis is a genetic disorder. It is a recessive trait that is determined by two alleles. Suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. Which statement reflects the likelihood of a child of these parents having cystic fibrosis?

The child cannot have the disease because only the dominant alleles will be passed on.

The child will have the disease because only recessive alleles will be passed on.

The child may or may not have the disease because a recessive gene from each parent may be passed on.

The child may or may not have the disease because the disease does not depend on the alleles of the parents.

Which scenario breaks the law of segregation?

a gamete contains the father’s allele

the gametes produced each have 1 allele after meiosis II

a gamete produced has 2 of the same alleles after meiosis II

the gamete fertilized has the dominant trait

Who would be the best people to study to help assess how genetics and the environment influence the expression of traits?

identical twins that were adopted and raised by different families

identical twins that were raised together by their mother and father

a brother and sister that were adopted and raised by different families

a brother and sister that were raised together by their mother and father

Which are different forms of the same gene?

genotypes

phenotypes

alleles

traits

Svetlana and her mother are very similar. Both have blonde hair, a love of scrapbooking, blue eyes, and a thin nose. Which statement most likely describes Svetlana’s traits?

Svetlana inherited her love of scrapbooking from her mother, but her blue eyes come from her environment.

Svetlana inherited her blue eyes from her mother, but her love of scrapbooking comes from her environment.

Svetlana inherited her thin nose from her mother, but her blonde hair comes from her environment.

Svetlana inherited her blonde hair from her mother, but her thin nose comes from her environment.

Which represents the cross between parent plants if one is heterozygous and has yellow-colored pods and the other is homozygous and has green-colored pods?

Yy ´ yy

YY ´ yy

Yy ´ Yy

yy ´ yy

Mendel was able to study seven traits in all the pea plants in each generation. Which of his hypotheses allowed him to analyze each trait separately?

If two different alleles for a gene occur together, one of the alleles may be expressed while the other is hidden.

When gametes are formed, each gamete carries only one allele for the gene.

There are alternate versions of a alleles called genes.

For each inherited trait, there is only one copy of the gene that codes for that trait.

Which blood type could be given as a transfusion for patient with AB blood when the RH factor is unknown?

O+

A+

AB+

AB–

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