In mammals, sex is determined bya. the SRY gene on the Y chromosome.b. having two copies of the X chromosome.c. having one copy of the X chromosome.d. both a and c
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In mammals, sex is determined by
a. the SRY gene on the Y chromosome.
b. having two copies of the X chromosome.
c. having one copy of the X chromosome.
d. both a and c
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- Give two ways nature uses to hide differences between X- and Y-sperm in mammals?What is a sex-linked gene? A. A gene that influences sexual behavior B. A gene that has greater effects on one sex than the other C. A gene on either the X or Y chromosome D. A gene that becomes activated during sexual behaviorWhat mechanism do mammals use to compensate for the difference in X chromosome numbers in females versus males?
- How does the production of sperm differ from the production of eggs? a. Sperm production involves meiosis, whereas egg production involves only mitosis. b. Meiosis during sperm production produces four sperm cells, whereas meiosis during egg production produces only one functional egg cell. c. Sperm are haploid, whereas eggs are diploid. d. Sperm production begins during fetal development, whereas the meiotic process that begins egg production doesn’t begin until pubertyWhat is a sex-limited gene? a. A gene on the X chromosome b. A gene on the Y chromosome c. A gene that sex hormones activate d. A gene that becomes active during sexual activityAccording to the Lyon hypothesis,a. one of the X chromosomes is converted to a Barr body insomatic cells of female mammals.b. one of the X chromosomes is converted to a Barr body in allcells of female mammals.c. both of the X chromosomes are converted to Barr bodies insomatic cells of female mammals.d. both of the X chromosomes are converted to Barr bodies inall cells of female mammals.
- Which of the following statements regarding the Y chromosome in mammals is TRUE?A. The Y chromosome is less than half the size of the X chromosome.B.Y chromosomes are most often present in egg cells and are not found in sperm cells. C.Most female mammals have one Y chromosome. D. The Y chromosome contains no protein-coding genes.Dogs have a diploid chromosome number of 78. How many chromosomes do their gametes have? a. 39 c. 156 b. 78 d. 234Write a reflection/conclusion about the occurrences of certain hereditary traits, observing similarities or differences in traits between parents and offspring, and identifying which trait is dominant or recessive.
- In Mammals, the Sex of an Offspring Is Determined by the Sex Chromosome in the SpermThe nucleus of udder cell which was used to develop Dolly was taken from_______.a) Six year old Finn Dorset white sheep b) Seven year old white sheep. c) Six year old goat d) Five year old cowHow does the sexual life cycle increase the genetic variation in a species? a. by providing gametes with different combinations of parental chromosomes. b. by allowing the combination of chromosomes from two different individuals. c. by allowing recombination of the alleles on a chromosome. d. A and B only. e. A, B, and C. Explain your answer.
