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What is sex linkage? In mammals, which sex would be most likely to show recessive sex-linked traits? |
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- what is Sex-Linked and Sexually Dimorphic Traitsin Humans?Sex determination is different in birds and mammals. Describe how this difference in sex determination leads to a different probability of inheriting a sex-linked trait in male and female mammals versus birds.we discuss various mechanisms of sex determination, including the XX/XY system of placental mammals, and the ZZ/ZW system of birds. Monotremes, the most primitive mammals, have a very intriguing sex determination scheme that shares elements of both of these systems. Please use the internet to learn more about how sex in monotremes is determined. Then write a short essay (300-400 words) describing this system and comparing/contrasting it to the XX/XY and ZZ/ZW systems.
- If a white female mouse without spots is crossed to a gray male with brown spots, what proportion of their daughters would have the same phenotype as their mother? W = long whiskers (dominant) W'= black fur (incomplete dominance) w = short whiskers (recessive) W = white fur (incomplete dominance) E = long ears (dominant) e = short ears (recessive) S = presence of brown spots (dominant and sex-linked) s = absence of brown spots (recessive and sex-linked) The answer is none but i don't get how to set up the punnett square.The inheritance of colour in domestic pigeons involves several genes. The dominance hierarchy of three colour alleles is ash-red > blue-black > brown (ZA > ZB > Zb ).These colours are carried on the Z sex chromosome. Unlike humans, female pigeons have two different sex chromosomes (Z and W) and males have two of the same kind of sex chromosome (ZZ). Which of the following statements is true for sex-linked traits in birds? Select one: a. Females can inherit an allele for a Z-linked trait only from their father, and males can inherit an allele for a Z-linked trait only from their mother. b. Males can inherit an allele for a Z-linked trait only from their mother, and females can inherit an allele for a Z-linked trait from either their mother or father. c. Both sexes can inherit an allele for a Z-linked trait from either their mother or father. d. Females can inherit an allele for a Z-linked trait only from their father, and males can inherit an allele for a Z-linked trait…A green salamander is mated with a white salamander. In the offspring, 49% of their abies are green and 51% of the babies are white. What is the genotype of the green salamander?
- In fruit flies, gray body (G) is dominant to black body (g). If a male with a black body mates with a female that is homozygous dominant for her gray body what are the possible genotypes and phenotypes of their offspring? Complete the Punnett square below. What is the expected phenotypic ratio among the offspring?What is an example of a sex-linked trait in humans?Two brown bears have cubs in late spring. The mother bear has the phenotype for long front claws. The mother bear has the genotype (Aa), while the father has the same genotype as the mother. A) What percentage of the offspring will have long claws?
- Calico cats are almost invariably female. Why? (Hint: explain genotype and phenotype of calico females)In rabbits, the gene that codes for a spotted coat is dominant over the gene that codes for a solid coat, and the gene for the coat's black color is dominant over the gene for the coat's brown color. If a spotted, black-coated rabbit mates with a solid, brown-coated rabbit, what are the genotypes and phenotypes of their offspring?The inheritance of colour in domestic pigeons involves several genes. The dominance hierarchy of three colour alleles is ash-red > blue-black > brown (ZA > ZB > Zb ).These colours are carried on the Z sex chromosome. Unlike humans, female pigeons have two different sex chromosomes (Z and W) and males have two of the same kind of sex chromosome (ZZ). In birds, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (ZW). Since female birds have only one Z chromosome, they have only one copy of all Z-linked genes and they express the phenotype of the allele that they get.Barred is a sex-linked dominant trait in chickens. The barring allele causes white pigment in bars on a solid color producing an alternating pattern. The original solid color in the chickens below is black. The possible genotypes and their corresponding phenotypes are as follows: Genotype Gender Feather Phenotype ZBZB Male Barred ZBZb Male Barred ZbZb Male Black…