Exposure to ____ at night can cause insomnia by altering melatonin secretion patterns
a. noise
b. bright light
c. physical movement
d. food
e. alcohol
b
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Dosage compensation in mammals typically involves the random inactivation of one of the two X chromosomes relatively early in development. Such X chromosome inactivation often leads to phenotypic mosaicism
Assume that black fur in cats is due to the X-linked recessive gene b, whereas its dominant allele B produces yellow fur. A Bb heterozygote is a mosaic called "tortoise shell" or "calico." Using appropriate gene symbols, diagram a mating between a black male and a calico female. Give the phenotypes and genotypes of all the offspring.
________ is the study of the geographic distribution of organisms
Fill in the blank(s) with correct word
During the sporophyte generation in the life cycle of a fern, the plant releases ________ that germinate and become gametophytes.
A. diploid gametes B. haploid spores C. diploid spores D. haploid gametes
Which cell would have an inactivated X chromosome?