1. If a true-breeding white flowered plant is bred with a true-breeding purple f
ID: 94184 • Letter: 1
Question
1. If a true-breeding white flowered plant is bred with a true-breeding purple flowered plant, what are thegenotypes of the offspring?
A. heterozygous dominant
B. heterozygous
C. homozygous dominant, heterozygous, and homozygous recessive
D. homozygous dominant and heterozygous
E. homozygous dominant and heterozygous recessive.
2. Coat color for a breed of cattle is determined by two co-dominant alleles, one for white (W) and one for red (R). A heterozygote will be a mixed color, called roan. Crossing two roans produces an equal number of white or red offspring and twice as many roans. If a farmer wanted a herd of cattle that were all roans, what color should the two parents be?
A. white and red
B. roan and red
C. roan and roan
D. roan and white
E. red and red
3. Given what we know about Mendel's experiments with pea plants, what would be the genotype for true-breeding purple-flowered pea plants? Purple is a dominant trait while white is a recessive trait.
A. purple
B. P
C. heterozygous
D. PP
Explanation / Answer
1. If a true-breeding white-flowered plant is bred with a true-breeding purple flowered plant, then the genotypes of the offspring will be,
PP(Purple) X pp(white) we will get Pp, Pp, Pp and Pp(heterozygous)
2. Coat colour for a breed of cattle is determined by two co-dominant alleles, one for white (W) and one for red (R). A heterozygote will be a mixed colour, called roan. Crossing two roans produce an equal number of white or red offspring and twice as many roans. If a farmer wanted a herd of cattle that were all roans, then the colour should the two parents be A. white (WW) and red (RR).
Cross: WW and RR we will get WR, WR, WR and WR( all roans).
3. The genotype for true-breeding purple-flowered pea plants will be PP. Purple is a dominant trait while white(pp) is a recessive trait. As we know that dominant trait always expressed by the capital letter. So, the answer is D.
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