Question

Question 11 pts

Alternate forms of a gene that govern the expression of the same trait and that occur at the same positions on homologous chromosomes are called ________.

alleles

chromatids

mRNA

gametes A cross between two heterozygous individuals (RrYy) at two independently assorting genes will produce an expected phenotypic ratio of ______. 1:2:1 3:1 9:3:3:1 15:1

Answer 1

11) The correct option is alleles.

Alleles are each of two or more alternative forms of a gene, which arise by mutation. They are present at the same place on a chromosome.

12) The correct option is 9:3:3:1.

The genotype of heterozygous plant individuals with Round and yellow seed- RrYy.

let:
Round -RR(dominant).

YY- Yellow(dominant).

rr- wrinkled(recessive).

yy- green(recessive)

Cross RrYy X RrYy

Gametes formed RY, Ry, rY and ry   RY, Ry, rY and ry.

Next generation:

Male/Female	RY	Ry	rY	ry
RY	RRYY(round and yellow)	RRYy(round and yellow)	RrYY(round and yellow)	RrYy(round and yellow)
Ry	RRYy(round and yellow)	RRyy(round and green)	RrYy(round and yellow)	Rryy(round and green)
rY	RrYY(round and yellow)	RrYy(round and yellow)	rrYY(wrinkle and yellow)	rrYy(wrinkle and yellow)
ry	RrYy(round and yellow)	Rryy(round and green)	rrYy(wrinkle and yellow)	rryy(wrinkle and green)

Then, the phenotypic ratio = 9:3:3:1.

Round and yellow = 9.

Round and green = 3.

Wrinkle and yellow= 3.

Wrinkle and green = 1.