Comb shape in chickens represents one of the classic examples of gene interaction. two gene pairs interact to influence the shape of the comb. the genes for rose comb ( r) and pea comb ( p) together produce walnut comb. the fully homozygous recessive condition ( rrpp) produces the single comb. assume that a rose-comb chicken is crossed with a walnut-comb chicken and the following offspring are produced: 17 walnut, 16 rose, 7 pea, 6 single. (a) what are the probable genotypes of the parents? (b) give the genotypes of each of the offspring classes.

who knows

explanation:

b. the carbon cycle ensures living things have a source of hydrogen

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

the electromagnetic energy from the sun arrives in the form of visible and invisible light.