Question

In: Biology

The hair color and freckle genes in humans are on two different chromosomes. Red hair (d)...

The hair color and freckle genes in humans are on two different chromosomes. Red hair (d) is recessive to dark hair (D) and freckles (f) are recessive to the homogenous skin coloration (F). Two people who are both heterozygous for both genes have a child.

A. What is the probability that their child will have red hair?

B. What is the probability that their child will have freckles?

C. What is the probability that their child will have red hair and freckles?

Linked Dihybrid Cross with Complete Dominance in Both Genes

6. Assume that the genes for tail length and fang length in Towson Tigers are tightly linked. Further assume that long tails (L) are dominant to short tails (l) and that long fangs (F) are dominant to short fangs (f). Tigers from two true breeding strains, one with long tails and short fangs and the other with short tails and long fangs are crossed to produce an F1 generation, then those cubs are mated to produce an F2 generation

A. What is the genotype of each of the original parents?

B. What is the genotype and phenotype of the cubs in the F1 generation?

C. What gametes can each of the F1 animals produce?

D. What proportion of the F2 animals will have long tails and short fangs?

E. What proportion of the F2 animals will have long tails and long fangs?

Sex-Lined Inheritance

7. In humans red/green color blindness is a recessive, X-linked trait. X^N is used to denote the normal vision allele and Xⁿ to denote the recessive allele. A color blind woman has children with a man who has normal vision.

A. What are the genotypes of each of the parents?

B. Is the probability that their first child will be a color blind son?

C. Is the probability that their first child will be a color blind daughter?

D. Wat proportion of their daughters would carriers for the trait?

Expert Solution

gladiator answered 2 years ago

In humans, hair color is controlled by the interaction of two genes. The same pigment, melanin,...

In humans, hair color is controlled by the interaction of two genes. The same pigment, melanin, is present in chestnut-haired and blond-haired people, but chestnut people have much more. Brown hair (B) is dominant of blonde (r). Feeling melanin depends on another gene. The dominant form of this second gene (M) allows the synthesis of melanin; the recessive form (m) prevents such synthesis. Recessive homozygous (mm) are albinos. For each of the following junctions mention the phenotype of the parents....

A scientist is studying the inheritance of two traits, red hair color and freckles. The genotypes...

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1)Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision...

1)Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color-blind son. What are the genotypes of the parents? A)XnXn and XnY B)XNXN and XNY C)XNXn and XNY D)XNXN and XnY 2)A poison interferes with the action of RNA polymerase II, but not RNA polymerase I or III. Which of the following is likely to be true of a cell exposed to the poison? A)production of tRNA would be stopped but not...

A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A...

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4. In humans, red-green color blindness is recessive to normal sight. The gene for this trait is...

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How are DNA chromosomes and genes related?

How are DNA chromosomes and genes related? Give details Explaination

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Red-green color blindness is due to an X-linked recessive allele in humans. A widow’s peak (a...

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answer use a different color, please) 1. In shorthorn cattle the gene for red coat color...

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