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Flashcards in Unit 8 Bio Test Deck (30)
0

Which of the following is an example of polygenetic inheritance?
A) pink flowers in snapdragons
B) skin pigmentation in humans
C) the ABO blood groups in humans
D) Huntington's disease in humans
E) white and purple flower color in pease

B) skin pigmentation in humans

1

Hydrangea plants of the same genotype are planted in a large flower garden. Some of the plants produce blue flowers and others pink flowers. What is the explanation behind this?

environmental factors such as soil pH levels

2

When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype?

50%

3

Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. This suggests ______________.

that the parents were both heterozygous

4

A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). It's genotype is HhTt. Which is a possible genotype in a gamete from this organism?
A) tt
B) HhTt
C) HT
D) Hh
E) T

C) HT

5

A woman has six sons, what is the chance that her next child will be a girl?

1/2 (50%)

6

A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. What is a possible genotype for the mother?

IAi

7

What described the ABO blood group system?

multiple alleles

8

A pedigree analysis of a given disorder's occurrence in a family shows that, although both parents of an affected child are normal, each of the parents has had affected relatives with the same condition. That makes this disorder __________.

recessive

9

Two characteristics that appear in a 9:3:3:1 ratio in the F2 generation should have what property?

the genes controlling the characters obey the law of independent assortment

10

Mendel accounted for the observation than traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that ________________.

traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1 generation

11

Two true-breeding stocks of pea plants are crossed. One parent has red, axial flowers and the other has white, terminal flowers; all F1 individuals have red, axial flowers. The genes for flower color and location assert independently. 1,000 F2 offspring resulted from the cross, approximately how many then would have red, terminal flowers?

190

12

Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long talks (t). What fraction of the progeny of the cross BbTt x BBtt will have black fur and long tails?

1/2 (50%)

13

In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red: 2 roan: 1 white?
A) roan x roan
B) white x roan
C) cannot be determined
D) red x roan
E) red x white

A) roan x roan

14

______________: having two different alleles for a gene

heterozygous

15

______________: an organism's appearance or observable traits

phenotype

16

________________: the genetic makeup of an individual

genotype

17

___________: a variant for a character

trait

18

____________: an alternative version of a gene

allele

19

_______________: a heritable feature that varies among individuals

character

20

_____________: has no effect on phenotype in a heterozygote

recessive allele

21

___________: a heritable unit that determines a character and can exist in different forms

gene

22

________________: a cross between individuals heterozygous for a single character

monohybrid cross

23

_____________: determines phenotype in a heterozygote

dominant allele

24

____________: having two identical alleles for a gene

homozygous

25

___________: a cross between an individual with an unknown genotype and a homozygous recessive individual

testcross

26

A man with hemophilia has a daughter of normal phenotype. She marries a man who is normal for the trait. What are the chances (percentage) a son will be a hemophiliac?

50%

27

A man with hemophilia has a daughter of normal phenotype. She marries a man who is normal for the trait. What is the probability (percentage) a daughter will be a hemophiliac?

0%

28

A tall, curly haired Hoo married a Hoo who was short with curly & spiked hair. What are the chances (percentage) they will have a curly & spiked, medium baby Hoo?

50%

29

Peter Smith has blood type B. Leslie Smith has blood type O. They have two children of their own and one adopted child. Meg has blood type AB, Dave has blood type O, and Haley has blood type B. Which child is adopted? What is the adopted child's genotype? What are the genotypes of the parents?

1) meg
2) IaIb
3) ii
4) Ibi