Genetics- large muscles

The function of myostatin protein is

• To regulate muscle growth

• To help muscles contract

• To help in the chromosomes

• To make muscles extra big

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Myostatin with holes causes

• Typical muscles

• Large muscles

• Super small muscles

• No effect on muscles

Myostatin proteins with holes cause big muscles because

• The receptors fit perfectly causing muscles to grow big

• The receptors do not fit causing the muscles to shrink

• The receptors do not fit causing the muscles to keep growing

• The receptors fit better causing large muscles

This is a picture of a karyotype. A karyotype:

• Shows only the chromosomes of females

• Shows only genetic diseases

• Shows half of the chromosomes of an organism

• Shows all of the chromosomes of an organism in size order.

The chromosomes are located in this part of a cell

• Cytoplasm

• Nucleus

• Cell membrane

• Mitochondria

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Which of the following is true about the sex cells

• They have twice as many chromosomes than muscle cells

• They have the same amount of chromosomes than muscle cells

• They each have half as many chromosomes as muscle cells

• They do not have any chromosomes

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A phenotype is

• The physical appearance of an organism

• The genetic make up of an organism

• The same as the genotype

• Is only found in cattle

What is true about a dominant trait

• It is usually hidden

• It is always expressed

• It can only be passed down by the male

• It can only be passed down by the female

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Mrs. Somers has brown eyes and she has 3 kids. All of her kids have blue eyes. How is this possible?

• Her husband has brown eyes. Brown eyes are recessive.

• Her dad had blue eyes and she passed down the recessive trait.

• Blue eyes are recessive so this is impossible

• Blue eyes are dominant

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How many alleles of each trait do you typically have?

• 4- 2 from mom and 2 from dad

• 1- one from either mom or dad

• scientists don't know

• 2- one from mom and one from dad

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