Please only answer if you answer ALL PARTS, otherwise you\'re unfortunately wast
ID: 278705 • Letter: P
Question
Please only answer if you answer ALL PARTS, otherwise you're unfortunately wasting one question for me.. Thank you!
And please show explanations on how you decide on answers!:))
1. In humans, dimples is inherited as a dominant trait. A man heterozygous for dimples marries a woman without dimples. a. What are the genotypes of the couple? Father: Mother: b. What proportion of their children will have dimples? 2. In guinea pigs, the allele for black fur (B) is dominant over the allele for white fur (b). Aback male guinea pig is mated to a white female guinea pig. The offspring were 7 black and 6 white guinea pigs. What are the genotypes of the parents? Father: Mother: 3. A brown mouse (B) is mated to a white mouse (b) and all of their offspring are brown. a. Which allele is dominant. b. What are the genotypes of the mice that were crossed? c. If two of the brown offspring were mated together, what percentage of the F2 mice would be brown?Explanation / Answer
Answer:
1) Dimples is inherited as a dominant trait
Let dominant allele be represented by (D) and recessive allele by (d)
Man Heterozygous for Dimples (Dd) x Woman without dimples (dd) homozygous recessive)
a) Genotypes of the couple:
b) What proportion of their children will have dimples:
Punnett Square: Dd x dd
Based on the punnett square, the proportion of children who will have dimples (Dd) = 2/4 = 1/2 = 0.5 (50%)
2) In Guinea pigs:
3) Brown Mouse (B) is mated to White Mouse (b) ---> All offsprings are Brown
a) Which allele is dominant : B allele is dominant
b) What are the genotypes of the mice that were crossed: Brown (BB) x White (bb) ---> Bb, Bb, Bb, Bb (All Brown)
c) If two of the brown offsprings were mated together, what percentage of the F2 mice would be brown:
Genotype of Brown offspring will be Bb
Bb x Bb ----> BB, Bb, Bb, bb
Punnett Square:
Percentage of F2 mouse that would be brown (Bb and BB) = 3/4 = 0.75 = 75%
d d D Dd Dd d dd dd