Inheritance Patters Worksheet PDF

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Name: ______Samantha Vasquez______

Period: _5_

Date: __Jan 6___

Patterns of Inheritance Problems: Monohybrid Crosses DOMINANCE / recessiveness 1. In humans widow’s peak (W) is dominant over straight hairline (w). A heterozygous man for this trait marries a woman who is also heterozygous. a. What is the genotype for the man?

_W__

__w__

__W__

WW

Ww

__w__

Ww

ww

__Ww__

b. What is the genotype for woman?

_Ww__

c. What will be the genotype and phenotype of the first generation? Ww,WW,ww Widow’s peak

2. Cystic fibrosis is a recessive genetic disorder. Ron is homozygous dominant (FF) and Nancy is a carrier of cystic fibrosis? a. What is the genotype for Ron?

__F__

__f__

__F_

FF

Ff

_F__

FF

Ff

__FF__

b. What is the genotype for Nancy?

__Ff__

c. Use a Punnett square to predict the probability that one of their children will have cystic fibrosis.

0%

3. Hornless (H) in cattle is dominant over horned (h). A homozygous hornless bull is mated with a heterozygous cow. a. What is the genotype of the bull?

__HH__

b. What is the genotype of the cow?

___Hh_

c. What will be the genotype and phenotype of the first generation?

HH,Hh

No horns

_H__

__h__

_H__

HH

Hh

_H__

HH

Hh

4. CHALLENGE In humans, acondroplasia “dwarfism” (D) is dominant over normal (d). A homozygous dominant (DD) person dies before the age of one. A heterozygous (Dd) person is dwarfed. A homozygous recessive individual is normal. A heterozygous dwarf man marries a dwarf heterozygous woman. What is the probability of having a normal child? What is the probability of having a child that is a dwarf? What is the probability of having a child that dies at one from this disorder?

25% 75% 25%

INCOMPLETE DOMINANCE 5. In snapdragons, a gene that affects flower color has two alleles: red (R) and white (W). In heterozygous individuals, the phenotype is pink. a. What is the genotype of a pink flower?

b. Show a cross between two pink snapdragons and give the expected genotype and phenotype.

RR,Rw,ww

__R_

__w__

_R__

RR

Rw

_w__

Rw

ww

__Rw__

Pink Red White

6. CHALLENGE In Andalusian fowls, black individuals (B) and white individuals (b) are homozygous. Heterozygous individuals are bluish-gray. What results if a black individual is crossed with a bluish-gray individual? Show the cross as well as the genotypes and phenotypes of the parents and offspring. B W Genotypes: BB , BW BB

BW

BB

BW

Phenotypes: black, grey B

B

CODOMINANCE 7. In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette. a. What is the genotype for black chickens?

_BB_

b. What is the genotype for white chickens?

__WW

c. What is the genotype for erminette chickens?

_BW__

d. If two erminette chickens were crossed, what is the probability that: i. They would have a black chick?

25__%

ii. They would have a white chick?

_25_%

iii. They would have an erminette chick?

_100_%

8. CHALLENGE In shorthorn cattle, coat color may be red, white, or roan. In roan cattle, their coats are a mixture of red and white hairs, although the animals appear a light rust color from a distance. Show a cross between a roan bull and a red cowe and give the expected genotype and phenotype. R

R

W

R

RR

RR

RW

RW

Genotypes: RR,RW Phenotypes: Red cows, Roan cows...