7. Quiz 2

Someone who has the blood type AB had parents with _____ genes. incomplete dominant codominant heterozygous homozygous

codominant

In the cross BB x bb, the percent of offspring in the F1 generation that will have the same genotype as one of their parents is _____. 100% 50% 25% 0%

0%

The probability that both of two tossed coins will come down heads is _____. 1/4 1/8 1/16

1/4

The F2 generation phenotypes resulting from the monohybrid cross of purebreds display a ratio of _____. 4:1 2:1 3:1 none of the above

3:1

Mendel's principle of segregation implies that the two members of an allelic pair of genes _____. are distributed to separate gametes may contaminate one another are associated dependently, depending on all other genes are segregated pair-wise

A

When neither gene in a genotype pair is dominant and neither gene is recessive, the genes are said to be _____. multiple alleles incomplete dominant alleles incomplete alleles

B

A family has seven sons. The chance that their eighth child will be a daughter is _____. one chance in seven one chance in eight one chance in two practically none

C

If the parent genotypes are Aa and Aa, the offspring are expected to be _____. 1/2 AA and 1/2 aa all Aa 1/4 AA, 1/2 Aa, 1/4 aa 3/4 AA and 1/4 aa

C

In considering the cross YyRr x YyRr, the phenotype ratios of the F2 generation will be _____. 1:3:1 3:1 9:3:3:1 4:1

C

Gregor Mendel is considered the Father of _____. Heredity DNA Genetics Inheritance

Genetics

Suppose you have monohybrid snapdragons in your garden and you find that they produce red seeds to white seeds in the ratio of 3:1. If the alleles are designated R (red seeds) and r (white seeds), what are the probable genotypes of the snapdragons in your garden? RR and Rr RR only RR and rr Rr only rr only

Rr only

Which cross will yield four phenotypes in the 1:1:1:1 ratio? rryy x rryy RrYy x rryy RrYy x RrYy RRYY x rryy

RrYy x rryy

Suppose you have monohybrid snapdragons in your garden and you find that they produce red seeds to white seeds in the ratio of 3:1. If the alleles are designated R (red seeds) and r (white seeds), what are the probable phenotypes of the parents (P1)? half red and half white all white all red unable to determine

all red

In a dihybrid cross, round (RR), yellow (YY) seeds were crossed with wrinkled (rr), green (yy) seeds. What were the phenotypes of the F1 generation? all round and yellow all wrinkled and green half round and yellow; half wrinkled and green 3:1 (round and yellow to wrinkled and green)

all round and yellow

Different forms of a given gene are known as _____. alleles chromosomes recessives dominants

alleles

The principle of _____ suggests that a plant with the genotype Tt will display a tall phenotype. incomplete dominance codominant dominance segregation

dominance

Genes that carry contrasting inheritance factors are called _____. heterozygotes homozygotes alleles

heterozygotes

A TT genotype is said to be _____. homozygous heterozygous dihybrid

homozygous

_____ interact to produce a trait in which neither dominant gene can produce its effect in the presence of the other. Multiple alleles Chromosomes Carriers Sex linked genes

multiple alleles

The outward appearance of a particular trait is called the _____.

phenotype