In humans, males are heterogametic and females are homogametic, Explain. Are there any examples where males are homogametic and females are heterogametic? Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.
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- In humans males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females are heterogametic. Also, describe as to who determines the sex of the unborn child and if temperature plays a role in sex determenination.In certain salamanders, the sex of a genetic female can be altered, changing her into a functional male; these salamanders are called sexreversed males. When a sex-reversed male is mated with a normal female, approximately 23 of the offspring are female and 13 are male. How is sex determined in these salamanders? Explain the results of this cross.In certain salamanders, the sex of a genetic female can be altered, changing her into a functional male; these salamanders are called sex reversed males. When a sex-reversed male is mated with a normal female, approximately 23 of the offspring are female and 13 are male. How is sex determined in these salamanders? Explain the results of this cross
- Give an explanation for why nondisjunction of sex chromosomes is extra nicely tolerated than nondisjunction in autosomes, even though genetic nondisjunction of sex chromosomes usually effects in sterility and abnormalities of intercourse organs.A sperm cell from the fruit fly Drosophila melanogaster contains four chromosomes. How many chromosomes would be present in a spermatogonial cell about to enter meiosis? How many chromatids would be present in a spermatogo- nial cell at metaphase I of meiosis? How many would be present at metaphase II?. A mature female wolf, with 78 diploid chromosomes in each somatic cell, produces haploid oocytes (egg cells) containing how many chromosomes per cell? 1 sex-determining chromosome (Y) and 38 autosomes 2 sex-determining chromosomes (XX) and 76 autosomes 1 sex-determining chromosome (X) and 39 autosomes 2 sex-determining chromosomes (XY) and 76 autosomes 1 sex-determining chromosome (X) and 38 autosomes
- Each sperm of a pea plant contain seven chromosomes. What are the haploid and diploids for this species?Explain why nondisjunction of sex chromosomes is more well-tolerated thannondisjunction in autosomes, even though genetic nondisjunction of sex chromosomes usually results in sterility and abnormalities of sex organs.Butterflies have an X-Y sex-determination system that is different from that of flies or humans. Female butterflies may be either XY or X0, while butterflies with two or more X chromosomes are males. This photograph shows a tiger swallowtail gynandromorph, which is half male (left side) and half female (right side). Given that the first division of the zygote divides the embryo into the future right and left halves of the butterfly, propose a hypothesis that explains how nondisjunction during the first mitosis might have produced this unusual-looking butterfly. Question is also in the picture.
- Crossing-over does not occur between any pair of homologous chromosomes during meiosis in male Drosophila. From what you have learned about meiosis and crossing-over, propose one hypothesis for why this might be the case.In Drosophila, the X chromosomes may become attached to one another (XXn ) such that they always segregate together. Some flies thus contain a set of attached X chromosomes plus a Y chromosome. (a) What sex would such a fly be? Explain why this is so. (b) Given the answer to part (a), predict the sex of the off-spring that would occur in a cross between this fly and a normal one of the opposite sex. (c) If the offspring described in part (b) are allowed to interbreed, what will be the outcome?A mature female tiger, with 38 diploid chromosomes in each somatic cell, produces haploid oocytes (egg cells) with how many chromosomes per cell? A. 18 autosomes, and 1 sex-determining chromosome (Y) B. 36 autosomes, and 2 sex-determining chromosomes (XX) C. 18 autosomes, and 1 sex-determining chromosome (X) D. 34 autosomes, and 2 sex-determining chromosomes (XY) E. 17 autosomes, and 1 sex-determining chromosome (X)