Cross a heterozygous green skinned zork with a yellow skinned zork. a. what do the possible offspring look like?

When heterozygous green skinned zork is crossed with a yellow skinned zork, they will produce two types of offspring that are- green skinned and yellow skinned zork.  

Explanation-

As per the information in the question, green skinned zork has heterozygous genotype ( let us consider 'Gg'), which indicates that green skin is a dominant trait. This is because dominant allele ( a variant of gene that is depicted by capital letter) always expresses itself over the recessive allele.

Recessive allele is expressed only when present in a homozygous condition ( such as yellow skin in this question is a recessive trait with genotype 'gg').

The genotypes of parent are- Gg (heterozygous green skinned zork) and gg (yellow skinned zork).

When they are crossed, they will produce two types of offspring that are- green skinned and yellow skinned zork.  

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

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.