Question

white. What are the predicted color phenotypes and their frequencies for the 1. In cattle, RR red, Rr-roan, and offspring from crosses between: a. a red bull and a white cow b , a red bull and a roan cow a roan bull and a roan cow What type of inheritance controls these cattle fur colors? 2. Given the following information about the inheritance of characteristics in pea plants, answer the questions below Y (yellow) is dominant to y (green), R (round) is dominant tor (wrinkled), B (bitter) is dominant to b (sweet) S (smooth) is dominant to s (hairy), L (long pod) shows incomplete dominance to 1 (short pod) (Llis medium in length), Given this cross: (PI) Yy Rr Bb SS Ll (male) x yy RR Bb Ss Ll (female) a. How many different gametes can be formed by the female plant? b. How many different genotypes are possible in the FI offspring? hairy, medium, and c. How many different phenotypes are possible in the FI offspring? d. What percent of the F1 individuals will be: green, bitter, and smooth sweet - round, bitter, and long 3. In humans, the ABO blood groups are controlled by three alleles (only two of which occur in any one individual): th alleles for A and B type blood are co-dominant toward each other, and both are dominant to the allele for O type blood. a. If a person with type AB blood marrics someone with type O blood, what are the possible phenotypes of their offspring? In the following, determine the genotypes of the parents: b. One parent has type A and the other has type B, but all four blood groups are represented in the children. c. Both parents have type A, but 3/4 of the children are A and 1/4 are 0. d. One parent has type AB and the other has type B, but of the children 1/4 have type A, 1/4 have type AB, and 1/2 type В. 4. In the following cases of disputed paternity, determine the probable parent. a. Mother is type B, child is type O. Father #1 is A; father #2 is AB. b. Mother is type B, child is type AB. Father #1 is A; father #2 is B. c. Mother is type and bears non-identical twins, one type A and one type B. Father #1 is type A; father #2 is typ

Answer 1

1. Red bull x white cow

RR X rr

	R	R
r	Rr	Rr
r	Rr	Rr

100% roan

b. Red bull x roan cow

RR X Rr

	R	R
R	RR	RR
r	Rr	Rr

50%- red

50%- roan

c. Roan bull x roan cow

Rr x Rr

	R	r
R	RR	Rr
r	Rr	rr

25%- red

50%- roan

25%- white

This is incomplete dominance where one allele for a specific trait is not completely expressed over its paired allele. This results in a third phenotype in which the expressed physical trait is a combination of the phenotypes of both alleles.