Suppose you carry out a cross with fruit flies where you follow the inheritance of alleles at four different gene loci: one locus controls body color, one locus controls eye color, one locus controls wing length, and one locus controls wing shape. At each locus, there is a dominant allele and a recessive allele. The four loci follow Mendel's principle of independent assortment. A male that is heterozygous for all four loci is crossed with a female that is also heterozygous at all four loci. Complete the sentences that predict the results of this cross using the correct terms.The probability that a male gamete will have all four recessive alleles is .The probability that the F₁ offspring will have two dominant alleles at the gene locus that controls body color is .The probability that the F₁ offspring will be homozygous at the gene locus that controls body color is .The probability that the F₁ offspring will have two dominant alleles at all four gene loci is .The probability that the F₁ offspring will have the dominant phenotype for all four traits is .
Question
Suppose you carry out a cross with fruit flies where you follow the inheritance of alleles at four different gene loci: one locus controls body color, one locus controls eye color, one locus controls wing length, and one locus controls wing shape. At each locus, there is a dominant allele and a recessive allele. The four loci follow Mendel's principle of independent assortment. A male that is heterozygous for all four loci is crossed with a female that is also heterozygous at all four loci. Complete the sentences that predict the results of this cross using the correct terms.The probability that a male gamete will have all four recessive alleles is .The probability that the F₁ offspring will have two dominant alleles at the gene locus that controls body color is .The probability that the F₁ offspring will be homozygous at the gene locus that controls body color is .The probability that the F₁ offspring will have two dominant alleles at all four gene loci is .The probability that the F₁ offspring will have the dominant phenotype for all four traits is .
Solution
-
The probability that a male gamete will have all four recessive alleles is 1/16. This is because each locus independently sorts into gametes with a 1/2 chance of receiving the recessive allele (1/2 * 1/2 * 1/2 * 1/2 = 1/16).
-
The probability that the F₁ offspring will have two dominant alleles at the gene locus that controls body color is 1/4. This is because each parent has a 1/2 chance of passing on the dominant allele, and these probabilities multiply (1/2 * 1/2 = 1/4).
-
The probability that the F₁ offspring will be homozygous at the gene locus that controls body color is 1/4 for homozygous dominant (AA) and 1/4 for homozygous recessive (aa). This is because there is a 1/4 chance of receiving two dominant alleles (AA), a 1/2 chance of being heterozygous (Aa), and a 1/4 chance of receiving two recessive alleles (aa).
-
The probability that the F₁ offspring will have two dominant alleles at all four gene loci is 1/256. This is because the probability of being homozygous dominant at each locus is 1/4, and these probabilities multiply across the four loci (1/4 * 1/4 * 1/4 * 1/4 = 1/256).
-
The probability that the F₁ offspring will have the dominant phenotype for all four traits is 9/16 for each trait, so (9/16)^4 = 0.3164 or 31.64%. This is because the probability of displaying the dominant phenotype (being either homozygous dominant or heterozygous) at each locus is 3/4, and these probabilities multiply across the four loci.
Similar Questions
Which cross will produce only heterozygous offspring?Aa × aaAA × AaAa × AaAA × aa
1. When a strain of fruit flies homozygous for light body color is crossed with a strain of fruit flies homozygous for dark body color, all the offspring have light body color. This illustrates Mendel's principle of (1) segregation (2) domi- nance (3) incomplete dominance (4) indepen- dent assortment
Consider a green colored maize plant is crossed with a brown colored maize plant producing the following offsprings. [Green color is dominant over brown color; follows Mendelian inheritance pattern]Which of the following statement is correct in terms of this context? Both the parents are homozygous Both the parents are heterozygous One parent is heterozygous whereas the other one is homozygous Data insufficient to conclude
In a cross, an individual with an unknown genotype is mated with an individual with a homozygous recessive genotype to determine the unknown genotype.
Mendel's law of independent assortment states that alleles of different genes assort independently of one another during gamete formation. Which of the following statements best describes this principle?*1 pointAlleles of different genes are always inherited in a dominant manner.Alleles of different genes are linked and cannot be separatedAlleles of different genes are randomly assorted into gametes.Alleles of different genes are always inherited together.30. What is meant by the term "allele"?*1 pointA specific version of a gene that can vary.The combination of two different genes.The physical expression of a gene.The process of genetic recombination.
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.